Probably while leveling, 500 potency heal is a bit OP, but later on is even lower.

Physick/Cure + Both "Maim and Mend" Traits
400*1.1*1.3= 572 potency
400*1.4= 560 potency

I don't know the formula, but these are both posibles formulas and are pretty the same.

Later on I will try to transform into chemist or other healing type job since we have AST.

Wich other job can be healer? Chemist, Dancer/Bard and Geomancer? Probably Mystic?