I'm keeping this short. The AS and Grenade are OP. Even to armor. To balance them, give them a set fading damage radius. Make the Air Stomp Get more power the further you fall, instead of being a 20m powerjump insta-kill.
Or if people who are armored get hit by the AS, at least use force to toss them (alive) in a direction, while doing armor damage.
That is all, carry on.