I don't know if this has been suggested before, but would it make sense to have certain attacks increase their damage along with other attacks, like instead of the damage formula for Light Blast being:
Psy Power + Light Bomb Level + 2
it could be
Psy Power + Light Bomb Level + 1/2 Light Blast Level + 2
or something like that? If the hero levels one area of their power, shouldn't an upgraded version also benefit slightly?
For the sake of another example, Griffin has Melee, and he has Double Strike. It wouldn't make too much sense, if Griffin practiced enough, for his Double Strike to deal less damage than his Melee, would it?
If the game is too far along, or if this idea doesn't fit with the idea of having independent skills, this doesn't matter too much.