fire myth and balance only have 1 spell learnable from the high level trainers but the others have 2 so i think its time that they each had another spell put up for learning
fire backdraft or fuel would make fire more useful as a second class
myth shatter pierce cleanse ward stun blinding light would all be good just 1 to fill the spot
balance helping or availing hands would give some healing to people who pick balance as a second school