You can use CoSMOS to lower your evo points and the missions will work again after you save and reload with your lower points.
I had no luck with this, but I massively overdid it with CoSMOS the first go-around. Was lucky I had an older save to go back to, because I couldn't do any missions. Seems to be some protection built into the game...
I wonder if manually setting it so you level at, say, 4 or 5 over and over (set the 5 4-byte variables to like 3xp under the requirement, so 7997) and then just level up repeatedly until you've got your points how you want them?
Or if it's a more robust built-in cap on how many evolution points you can have, total. In which case I don't think something like that would work and we might be simply "forced" to play the game normally with regard to the basic character statistics.