Just force the points to be spread out.
I.e.
You have psi point equal to your level,.and gain 1 per turn.
Level 5: regain 2 per turn
Level 11: regain 3 per turn
Level 17: regain 4 per turn.
I also like
Overload
Maximize damage roll, but then you are stunned/ unconcious until the end of your...