A few quick checks, your Lab values for the colors in the palette are not correct, they’re somewhat subtly wrong (at least for the first 5 I checked, it not being ordered 1-255 didnt help!) perhaps missing a conversion from sRGB? (the palette hex values are sRGB)
here’s a dump of the exact Lab values the game uses for the palette colours for colour mixing:
Summary
[2019-08-23 00:19:31.544] [INFO] 9.76693 0.00116851 -0.00231196
[2019-08-23 00:19:31.544] [INFO] 10.0419 -2.52559 -7.11821
[2019-08-23 00:19:31.544] [INFO] 10.117 -0.245472 -16.5691
[2019-08-23 00:19:31.544] [INFO] 23.217 0.0841303 -10.6027
[2019-08-23 00:19:31.544] [INFO] 23.5335 6.08582 -14.0589
[2019-08-23 00:19:31.544] [INFO] 23.5436 8.56829 -5.91298
[2019-08-23 00:19:31.544] [INFO] 23.4405 16.9292 -11.35
[2019-08-23 00:19:31.544] [INFO] 23.498 25.4244 -23.2033
[2019-08-23 00:19:31.544] [INFO] 23.4189 45.3385 -28.3557
[2019-08-23 00:19:31.544] [INFO] 23.3289 35.1909 -13.9186
[2019-08-23 00:19:31.544] [INFO] 23.2342 42.8406 1.971
[2019-08-23 00:19:31.544] [INFO] 23.2146 35.4249 14.9003
[2019-08-23 00:19:31.544] [INFO] 23.2737 21.8917 14.4279
[2019-08-23 00:19:31.544] [INFO] 23.3297 12.4859 14.1682
[2019-08-23 00:19:31.544] [INFO] 23.4318 10.433 4.15001
[2019-08-23 00:19:31.544] [INFO] 23.2404 19.077 0.651001
[2019-08-23 00:19:31.544] [INFO] 10.0046 28.3181 1.03827
[2019-08-23 00:19:31.544] [INFO] 9.96656 18.2427 -7.66224
[2019-08-23 00:19:31.544] [INFO] 10.0233 12.186 0.636473
[2019-08-23 00:19:31.544] [INFO] 10.1002 5.10525 5.73537
[2019-08-23 00:19:31.544] [INFO] 9.88562 12.1134 13.8288
[2019-08-23 00:19:31.544] [INFO] 10.0188 28.1275 14.5083
[2019-08-23 00:19:31.544] [INFO] 23.4531 42.1685 30.0785
[2019-08-23 00:19:31.544] [INFO] 36.6169 56.3211 40.7069
[2019-08-23 00:19:31.544] [INFO] 36.6794 47.5058 19.9345
[2019-08-23 00:19:31.544] [INFO] 36.7 26.9143 12.2128
[2019-08-23 00:19:31.544] [INFO] 36.6927 14.1357 2.9954
[2019-08-23 00:19:31.544] [INFO] 36.5786 11.2805 12.2159
[2019-08-23 00:19:31.544] [INFO] 36.5576 4.36979 12.0046
[2019-08-23 00:19:31.544] [INFO] 36.7393 12.424 27.6292
[2019-08-23 00:19:31.544] [INFO] 36.72 6.97245 37.6374
[2019-08-23 00:19:31.544] [INFO] 36.5873 -0.370444 26.9289
[2019-08-23 00:19:31.544] [INFO] 36.6302 -5.66933 18.5984
[2019-08-23 00:19:31.544] [INFO] 36.6055 -9.12359 36.6735
[2019-08-23 00:19:31.544] [INFO] 36.8209 -21.9101 26.5024
[2019-08-23 00:19:31.544] [INFO] 36.6362 -39.1233 35.4884
[2019-08-23 00:19:31.544] [INFO] 23.2569 -29.1605 26.4433
[2019-08-23 00:19:31.544] [INFO] 23.2797 -12.2964 14.0232
[2019-08-23 00:19:31.544] [INFO] 23.377 -4.35107 14.3661
[2019-08-23 00:19:31.544] [INFO] 23.5048 -6.86164 27.5938
[2019-08-23 00:19:31.544] [INFO] 23.3267 4.92719 27.9745
[2019-08-23 00:19:31.544] [INFO] 23.2825 1.68597 13.7609
[2019-08-23 00:19:31.544] [INFO] 9.95691 1.67158 13.6809
[2019-08-23 00:19:31.544] [INFO] 10.1568 -4.57067 13.8398
[2019-08-23 00:19:31.544] [INFO] 9.90724 -7.86992 5.83466
[2019-08-23 00:19:31.544] [INFO] 9.83497 -10.138 -3.05883
[2019-08-23 00:19:31.544] [INFO] 23.227 -5.71185 -1.89571
[2019-08-23 00:19:31.544] [INFO] 26.2074 0.00191407 -0.00378709
[2019-08-23 00:19:31.544] [INFO] 36.4971 -1.73804 -4.54775
[2019-08-23 00:19:31.544] [INFO] 41.9647 0.00262865 -0.00520092
[2019-08-23 00:19:31.544] [INFO] 36.703 -2.02019 5.81454
[2019-08-23 00:19:31.544] [INFO] 36.7918 -7.91534 5.82586
[2019-08-23 00:19:31.544] [INFO] 36.7942 -15.588 11.8769
[2019-08-23 00:19:31.544] [INFO] 36.6548 -15.1982 1.7427
[2019-08-23 00:19:31.544] [INFO] 36.775 -20.9834 -6.29233
[2019-08-23 00:19:31.544] [INFO] 36.6511 -14.9619 -15.1454
[2019-08-23 00:19:31.544] [INFO] 36.6833 -8.13602 -24.333
[2019-08-23 00:19:31.544] [INFO] 36.791 6.72248 -41.7809
[2019-08-23 00:19:31.544] [INFO] 36.674 11.8444 -35.2162
[2019-08-23 00:19:31.544] [INFO] 36.7069 0.923368 -15.4817
[2019-08-23 00:19:31.544] [INFO] 36.8187 7.2989 -17.0942
[2019-08-23 00:19:31.544] [INFO] 36.5383 11.662 -8.04162
[2019-08-23 00:19:31.544] [INFO] 36.5411 23.013 -15.412
[2019-08-23 00:19:31.544] [INFO] 36.5911 33.9484 -30.7759
[2019-08-23 00:19:31.544] [INFO] 36.5859 32.4358 -46.7074
[2019-08-23 00:19:31.544] [INFO] 36.7029 65.0753 -76.4579
[2019-08-23 00:19:31.544] [INFO] 36.7633 62.401 -56.3171
[2019-08-23 00:19:31.544] [INFO] 36.6732 60.2108 -37.6774
[2019-08-23 00:19:31.544] [INFO] 36.6389 47.426 -19.2443
[2019-08-23 00:19:31.544] [INFO] 36.6102 36.8296 -6.17309
[2019-08-23 00:19:31.544] [INFO] 36.6209 57.444 2.74559
[2019-08-23 00:19:31.544] [INFO] 49.9992 46.3786 2.1609
[2019-08-23 00:19:31.544] [INFO] 49.9847 59.5782 -10.2591
[2019-08-23 00:19:31.544] [INFO] 50.0904 72.0909 3.63722
[2019-08-23 00:19:31.544] [INFO] 49.8949 71.4444 19.3181
[2019-08-23 00:19:31.544] [INFO] 50.1302 47.2527 17.517
[2019-08-23 00:19:31.544] [INFO] 49.972 71.1284 35.1778
[2019-08-23 00:19:31.544] [INFO] 50.0723 70.7779 51.2149
[2019-08-23 00:19:31.544] [INFO] 50.0984 46.2106 35.6731
[2019-08-23 00:19:31.544] [INFO] 50.0259 26.1798 15.4918
[2019-08-23 00:19:31.544] [INFO] 50.0424 20.3026 24.1682
[2019-08-23 00:19:31.544] [INFO] 50.1538 9.38239 15.2092
[2019-08-23 00:19:31.544] [INFO] 50.0836 5.06169 23.7339
[2019-08-23 00:19:31.544] [INFO] 50.1135 -1.23198 14.885
[2019-08-23 00:19:31.544] [INFO] 49.863 -7.04762 23.082
[2019-08-23 00:19:31.544] [INFO] 50.0503 -13.6894 15.0917
[2019-08-23 00:19:31.544] [INFO] 50.1106 -21.5474 6.81885
[2019-08-23 00:19:31.544] [INFO] 50.0407 -31.3323 0.668941
[2019-08-23 00:19:31.544] [INFO] 49.8665 -36.9146 11.4651
[2019-08-23 00:19:31.544] [INFO] 50.0129 -43.3643 25.7417
[2019-08-23 00:19:31.544] [INFO] 49.9074 -48.9899 44.6993
[2019-08-23 00:19:31.544] [INFO] 50.0555 -27.0097 33.1884
[2019-08-23 00:19:31.544] [INFO] 50.0879 -11.4557 46.0286
[2019-08-23 00:19:31.544] [INFO] 49.8904 -0.663605 46.3559
[2019-08-23 00:19:31.544] [INFO] 50.0686 8.69805 47.0583
[2019-08-23 00:19:31.544] [INFO] 50.1488 19.4745 47.7858
[2019-08-23 00:19:31.544] [INFO] 49.9385 31.4137 48.3371
[2019-08-23 00:19:31.544] [INFO] 63.23 37.8967 57.8379
[2019-08-23 00:19:31.544] [INFO] 63.2439 21.5499 41.2088
[2019-08-23 00:19:31.544] [INFO] 63.2291 24.9104 28.8854
[2019-08-23 00:19:31.544] [INFO] 63.2156 11.4082 17.8161
[2019-08-23 00:19:31.544] [INFO] 63.405 3.31131 8.84692
[2019-08-23 00:19:31.544] [INFO] 63.1907 -2.92543 8.40178
[2019-08-23 00:19:31.544] [INFO] 63.3011 -1.58445 18.1739
[2019-08-23 00:19:31.544] [INFO] 63.4577 3.47307 28.5136
[2019-08-23 00:19:31.544] [INFO] 63.3591 -3.02338 40.3859
[2019-08-23 00:19:31.544] [INFO] 63.1807 -8.61517 28.3331
[2019-08-23 00:19:31.544] [INFO] 63.4291 -16.3445 18.0133
[2019-08-23 00:19:31.544] [INFO] 63.3068 -9.51014 5.04661
[2019-08-23 00:19:31.544] [INFO] 63.445 -5.99091 -2.05153
[2019-08-23 00:19:31.544] [INFO] 57.8642 0.00334968 -0.00662752
[2019-08-23 00:19:31.544] [INFO] 50.0163 -3.33844 -4.25422
[2019-08-23 00:19:31.544] [INFO] 49.992 -9.66822 -3.20756
[2019-08-23 00:19:31.544] [INFO] 50.0366 -4.62977 7.03219
[2019-08-23 00:19:31.544] [INFO] 50.0389 2.84459 7.19114
[2019-08-23 00:19:31.544] [INFO] 50.0354 16.5345 0.91696
[2019-08-23 00:19:31.544] [INFO] 49.9546 14.4978 -10.0002
[2019-08-23 00:19:31.544] [INFO] 49.9877 30.1134 -12.6577
[2019-08-23 00:19:31.544] [INFO] 49.8541 43.9706 -28.695
[2019-08-23 00:19:31.544] [INFO] 50.0892 27.4355 -27.3878
[2019-08-23 00:19:31.544] [INFO] 50.1089 20.3778 -42.071
[2019-08-23 00:19:31.544] [INFO] 49.9363 39.3178 -70.201
[2019-08-23 00:19:31.544] [INFO] 50.0205 54.7358 -69.9145
[2019-08-23 00:19:31.544] [INFO] 49.9712 75.4088 -69.7753
[2019-08-23 00:19:31.544] [INFO] 50.0206 75.6129 -47.3075
[2019-08-23 00:19:31.544] [INFO] 63.3756 79.8921 -50.5348
[2019-08-23 00:19:31.544] [INFO] 63.2773 55.4302 -51.0379
[2019-08-23 00:19:31.544] [INFO] 63.457 37.9946 -50.9674
[2019-08-23 00:19:31.544] [INFO] 63.4066 24.8784 -51.2014
[2019-08-23 00:19:31.544] [INFO] 63.4083 13.739 -31.2364
[2019-08-23 00:19:31.544] [INFO] 63.3701 18.0551 -21.0738
[2019-08-23 00:19:31.544] [INFO] 63.3164 32.9424 -31.1141
[2019-08-23 00:19:31.544] [INFO] 63.2102 28.8224 -13.1817
[2019-08-23 00:19:31.544] [INFO] 63.3148 14.3533 -6.43711
[2019-08-23 00:19:31.545] [INFO] 63.2426 12.7688 4.82932
[2019-08-23 00:19:31.545] [INFO] 76.6686 12.5836 4.70183
[2019-08-23 00:19:31.545] [INFO] 76.7013 16.015 16.3136
[2019-08-23 00:19:31.545] [INFO] 76.6235 25.799 28.416
[2019-08-23 00:19:31.545] [INFO] 76.6919 22.5007 41.6449
[2019-08-23 00:19:31.545] [INFO] 76.7675 19.1459 58.6828
[2019-08-23 00:19:31.545] [INFO] 76.5523 9.22565 65.8182
[2019-08-23 00:19:31.545] [INFO] 76.6996 -3.09455 65.314
[2019-08-23 00:19:31.545] [INFO] 76.6476 -16.0716 64.6122
[2019-08-23 00:19:31.545] [INFO] 76.7413 -29.836 64.0814
[2019-08-23 00:19:31.545] [INFO] 76.6204 -46.8738 63.2452
[2019-08-23 00:19:31.545] [INFO] 76.601 -68.8193 62.4217
[2019-08-23 00:19:31.545] [INFO] 76.7735 -41.0294 32.6188
[2019-08-23 00:19:31.545] [INFO] 76.7762 -55.1348 22.4004
[2019-08-23 00:19:31.545] [INFO] 76.7936 -37.87 6.67
[2019-08-23 00:19:31.545] [INFO] 76.6772 -23.966 13.7716
[2019-08-23 00:19:31.545] [INFO] 76.7612 -18.0988 3.16198
[2019-08-23 00:19:31.545] [INFO] 76.7145 -21.0411 -6.7505
[2019-08-23 00:19:31.545] [INFO] 76.5514 -36.7601 -11.0251
[2019-08-23 00:19:31.545] [INFO] 76.6198 -29.8444 -21.6823
[2019-08-23 00:19:31.545] [INFO] 76.8083 -20.1695 -32.6335
[2019-08-23 00:19:31.545] [INFO] 76.7185 -6.95813 -32.6174
[2019-08-23 00:19:31.545] [INFO] 76.7017 3.54041 -32.5116
[2019-08-23 00:19:31.545] [INFO] 76.5418 14.103 -32.6225
[2019-08-23 00:19:31.545] [INFO] 76.8171 13.2403 -19.6936
[2019-08-23 00:19:31.545] [INFO] 76.6551 5.32935 -13.5175
[2019-08-23 00:19:31.545] [INFO] 76.7406 9.60918 -6.75202
[2019-08-23 00:19:31.545] [INFO] 76.6741 19.1832 -13.2576
[2019-08-23 00:19:31.545] [INFO] 76.7627 26.7727 -25.5668
[2019-08-23 00:19:31.545] [INFO] 76.636 34.0232 -15.7966
[2019-08-23 00:19:31.545] [INFO] 76.7355 47.9575 -31.8159
[2019-08-23 00:19:31.545] [INFO] 63.3909 56.179 -23.8138
[2019-08-23 00:19:31.545] [INFO] 63.2677 58.9578 2.51555
[2019-08-23 00:19:31.545] [INFO] 63.3798 37.3972 1.57595
[2019-08-23 00:19:31.545] [INFO] 63.5004 34.2742 14.87
[2019-08-23 00:19:31.545] [INFO] 63.3411 53.2328 26.6843
[2019-08-23 00:19:31.545] [INFO] 63.354 50.8504 38.9309
[2019-08-23 00:19:31.545] [INFO] 76.7737 30.2075 12.3925
[2019-08-23 00:19:31.545] [INFO] 76.7051 33.5281 1.35753
[2019-08-23 00:19:31.545] [INFO] 90.0098 19.0791 -13.2404
[2019-08-23 00:19:31.545] [INFO] 90.0269 7.74536 -5.472
[2019-08-23 00:19:31.545] [INFO] 89.946 5.30581 -13.57
[2019-08-23 00:19:31.545] [INFO] 90.0722 -4.02597 -13.5266
[2019-08-23 00:19:31.545] [INFO] 89.9732 -7.32366 -5.81448
[2019-08-23 00:19:31.545] [INFO] 89.874 -17.6135 -14.0349
[2019-08-23 00:19:31.545] [INFO] 76.7421 -10.6737 -9.27248
[2019-08-23 00:19:31.545] [INFO] 76.7912 -7.91263 -0.427259
[2019-08-23 00:19:31.545] [INFO] 74.0478 0.00408359 -0.0080796
[2019-08-23 00:19:31.545] [INFO] 76.7864 3.0112 10.1408
[2019-08-23 00:19:31.545] [INFO] 76.7029 8.0806 20.4659
[2019-08-23 00:19:31.545] [INFO] 76.5242 4.68193 32.9742
[2019-08-23 00:19:31.545] [INFO] 76.5208 -2.69296 21.0213
[2019-08-23 00:19:31.545] [INFO] 76.7692 -3.87281 9.97168
[2019-08-23 00:19:31.545] [INFO] 76.7129 -12.6119 21.0611
[2019-08-23 00:19:31.545] [INFO] 76.7793 -23.2485 33.0649
[2019-08-23 00:19:31.545] [INFO] 76.6849 -10.1149 33.2906
[2019-08-23 00:19:31.545] [INFO] 90.0635 -11.5614 38.0402
[2019-08-23 00:19:31.545] [INFO] 89.9617 -24.489 53.6518
[2019-08-23 00:19:31.545] [INFO] 89.9536 -44.6836 72.8383
[2019-08-23 00:19:31.545] [INFO] 90.0922 -58.7324 48.5774
[2019-08-23 00:19:31.545] [INFO] 89.9316 -34.5951 26.579
[2019-08-23 00:19:31.545] [INFO] 90.051 -17.6764 24.022
[2019-08-23 00:19:31.545] [INFO] 90.0993 -21.1933 6.77581
[2019-08-23 00:19:31.545] [INFO] 89.9045 -27.0067 -2.54946
[2019-08-23 00:19:31.545] [INFO] 90.128 -41.5611 4.3745
[2019-08-23 00:19:31.545] [INFO] 89.8496 -54.6456 17.3014
[2019-08-23 00:19:31.545] [INFO] 89.9768 -42.1725 -12.6447
[2019-08-23 00:19:31.545] [INFO] 63.2968 -31.5129 -9.45055
[2019-08-23 00:19:31.545] [INFO] 63.3651 -17.9644 -5.76479
[2019-08-23 00:19:31.545] [INFO] 63.3773 -24.2802 -20.5104
[2019-08-23 00:19:31.545] [INFO] 63.3746 -15.265 -32.7606
[2019-08-23 00:19:31.545] [INFO] 63.3976 -9.581 -18.6006
[2019-08-23 00:19:31.545] [INFO] 63.3693 -2.01199 -19.1055
[2019-08-23 00:19:31.545] [INFO] 63.3239 12.5166 -51.4683
[2019-08-23 00:19:31.545] [INFO] 63.2231 -0.128261 -51.2047
[2019-08-23 00:19:31.545] [INFO] 50.107 0.386872 -43.4414
[2019-08-23 00:19:31.545] [INFO] 49.9574 -12.0279 -28.0922
[2019-08-23 00:19:31.545] [INFO] 50.1383 -19.9897 -17.3251
[2019-08-23 00:19:31.545] [INFO] 49.8482 -25.9221 -8.40047
[2019-08-23 00:19:31.545] [INFO] 63.3745 -37.6491 0.727497
[2019-08-23 00:19:31.545] [INFO] 63.4582 -25.9278 7.78966
[2019-08-23 00:19:31.545] [INFO] 63.404 -44.5725 13.5344
[2019-08-23 00:19:31.545] [INFO] 63.4327 -52.0243 30.7946
[2019-08-23 00:19:31.545] [INFO] 63.2011 -58.8714 53.403
[2019-08-23 00:19:31.545] [INFO] 63.3295 -32.3316 39.8807
[2019-08-23 00:19:31.545] [INFO] 63.3978 -25.8294 54.8911
[2019-08-23 00:19:31.545] [INFO] 63.2768 -13.7561 55.3153
[2019-08-23 00:19:31.545] [INFO] 63.2465 5.94071 56.2951
[2019-08-23 00:19:31.545] [INFO] 89.9824 -2.58576 51.0949
[2019-08-23 00:19:31.545] [INFO] 90.0094 0.971291 27.5254
[2019-08-23 00:19:31.545] [INFO] 89.951 0.392316 13.8205
[2019-08-23 00:19:31.545] [INFO] 90.063 7.07561 15.7111
[2019-08-23 00:19:31.545] [INFO] 90.0785 11.408 4.20511
[2019-08-23 00:19:31.545] [INFO] 89.8837 0.00480173 -0.00950049
[2019-08-23 00:19:31.545] [INFO] 76.7398 -2.77517 -13.5154
[2019-08-23 00:19:31.545] [INFO] 63.4658 4.29263 -10.9303
[2019-08-23 00:19:31.545] [INFO] 50.1186 5.97577 -14.6415
[2019-08-23 00:19:31.545] [INFO] 50.0859 -1.16879 -16.5725
[2019-08-23 00:19:31.545] [INFO] 50.1065 25.4631 -70.042
[2019-08-23 00:19:31.545] [INFO] 36.5789 31.1544 -66.4163
[2019-08-23 00:19:31.545] [INFO] 36.6886 57.3812 -87.5207
[2019-08-23 00:19:31.545] [INFO] 23.2724 51.6107 -74.7447
[2019-08-23 00:19:31.545] [INFO] 23.4644 27.341 -53.5981
[2019-08-23 00:19:31.545] [INFO] 23.2419 6.8788 -33.0297
[2019-08-23 00:19:31.545] [INFO] 23.2355 -5.00092 -19.3357
[2019-08-23 00:19:31.545] [INFO] 23.378 -10.8025 -11.8343
[2019-08-23 00:19:31.545] [INFO] 23.266 -15.6019 -4.67905
[2019-08-23 00:19:31.545] [INFO] 23.4031 -22.7251 8.10985
[2019-08-23 00:19:31.545] [INFO] 9.90441 -18.2014 13.2205
[2019-08-23 00:19:31.545] [INFO] 36.6679 -29.868 9.58048
[2019-08-23 00:19:31.545] [INFO] 36.6545 -7.58644 -2.51951
[2019-08-23 00:19:31.545] [INFO] 23.4538 13.5508 -27.3854
[2019-08-23 00:19:31.545] [INFO] 10.0002 15.3198 -27.4332
[2019-08-23 00:19:31.545] [INFO] 9.92666 34.2804 -49.5625
[2019-08-23 00:19:31.545] [INFO] 23.2546 35.4333 -45.0022
[2019-08-23 00:19:31.545] [INFO] 9.97262 29.7854 -18.6332
[2019-08-23 00:19:31.545] [INFO] 10.0098 10.516 -11.4584
[2019-08-23 00:19:31.545] [INFO] 23.2564 18.6879 28.6709
[2019-08-23 00:19:31.545] [INFO] 36.6366 25.3616 38.7028
[2019-08-23 00:19:31.545] [INFO] 36.7231 28.3687 27.747
[2019-08-23 00:19:31.545] [INFO] 89.8915 -18.3827 73.9453