I checked up the game file with resource distribution parameters. What we have now?
Now we have 4 home world sets instead of one. And not all of them are included AT Components 
And now we have 4 metal moon sets instead of one too. Plus we have categories, which included: home1+home2+home3+home4+home1+home1+home1+home1.
Perhaps, this eight entries in category āhome_planetā is some layers which James speaked about. Perhaps we need to read it such way: chance to find copper in one block isā¦
- 1% in altitude [0; 32),
- 0.87% in altitude [32; 64),
- 0.77% in altitude [64; 96),
- 0.71% in altitude [96; 128)
- 1% in altitude [128; 256].
By the way, we have following calculated amount of every resource per 1000 blocks:
Please, be free to share your thought about.