You can’t get 85/105, the options are
| Seed | Produce | Bitumen near |
|---|---|---|
| 105% | 0% | 4 |
| 100% | 35% | 3 |
| 95% | 70% | 2 |
| 90% | 105% | 1 |
| 85% | 140% | 0 |
With farming epic, add 20% to all produce figures
Pattern to get an even “Near 3” (X = Bitumen in this case)
Near 2
Near 1
Full list of conditions and their effects here Boundless Farming Data