Hello, love the mod that you created, I always believed this game should work similarly to what you did with this mod. However, we need some settings to mess around. I found that dropping evolution overtime is just slightly too fast (is it tied to time factor for pollution in map settings?), Even starter bases (red/green/blue science) does not seem to be increasing evolution due to decrease in time.

The evolution increasing by evolution ~ 0 % is really fast, it will be much slower by evolution about 50%.
If the evolution is 0 %, it means that your factory is pretty small and clean, enemy bases are not in the pollution cloud (the chunk with spawners is not red).

You can try the mod NextGenEvolution, this mod is pretty balanced and uses total absorbed pollution by enemy spawners.