Here another suggestion:

Why don't you guys use the points from physical level to work in a similar way merit points did in FFXI?

Every level up would give you some points (maybe just use the current or new allotment amounts) and you being able to spend these points to enhance certain actions from classes you reached max rank.

Would be very nice seeing the enhanced effects of actions you like best when used by the native class (of course these points wouldn't affect the acrtions if used cross-class).

There's many options that could be used this way...

Cast, recast effect duration, accuracy, damage, incapacitation rate, increased effect of buffs, etc.

It could even offer exclusive action this way (maybe for jobs only so they could be job exclusive).