I mostly play with Angels smelting on top of Bob's Ores. Guess this is also true for most people. This changes, that you do not get the normal ores from Bob directly anymore, but one of 6 others, which can be refined into the long list of Bob's ores.
The ressources needed strongly depend on others mods added. Bob's ores alone make no sense at all as you need none of the new materials. Angels and Bob's are often played together and there I would just offer the 6 raw ores which can be refined into copper,iron, gold, silver, ...
Reasonable ratios you can also get from the mineral sludge chain, which directly creates the ores:
https://factorio.rotol.me/pack/bobsangels-f15-normal/i/fluid/mineral-sludge
Hence all but uran and flourite ore have same value as iron/copper. With uran 4 times the iron value and flourite 8 times.
Getting late game ores more early does not really help at all, because you cannot use them. I would not change ratios, but maybe add a tech to allow transformation only later on.
Another option is to give the 6 raw ores in exchange
This also makes it more easy as they are already balanced in the sense, that you need more research and more logistics to create the more valuable refined ores from the raw ores. The starting ones are Saphirite and Stiratite (they can even be melted directly into copper and iron plates). The next set is Rubyte and Bobmonium, which can be directly melted into lead and tin plates and the last set is Crotinnium and Jivolite (which cannot be melted without sorting into refined ores). The most easy refining gives you 3 iron/copper ores from 4 raw ores. Or you need 3 raw ores to make a iron/copper plate directly. Hence the raw ores are slightly less valueable than iron/copper. Late refinements gives up to 9 ores (but also the late game ones) from 9 raw ores, but require input of some liquids in the refining. And you do not get coal from refining at all. For Angelsbob mods, I would suggest just the same ratio for all 6 raw ores and coal.
I have not used your mod yet, but I would do it, if you add the 6 raw ores to it. Is it also possible to play the game with the https://mods.factorio.com/mod/Natural_Evolution_Enemies mod?