i think ppu spells should give exp using them.
the only way to lvl psi is the use of apu spells now.
for everyone that choose to use the bit of psi to heal themselves, leveling it is a pain.
missions are the only way to level psi and up until lvl 20 its ok to do so.
but above it just takes forever.

i also partied with an apu monk (or hybrid), but the gain in psi was minimal.
so please just let ppu spells also give exp on use. maybe just half of what an equal. apu spell gives.
shouldnt be hard to implement.