The thing is those 'unique spells' are terrible. What is the point of a unique ability when they can't be used?
Cure III is weaker than Cure II but AoE? Well that AoE is so small it can't even reach the melee DPS when you use it on the tank.
Assize has everything tacked onto it, so much so that you can't use it viably outside of mana return.
If they make the two spells useful throughput then maybe some uniqueness would be there without having to change other stuff.
Maybe make Cure III a bounce heal, heal the target and the lowest HP friendly target within 20y, that could be useful. Remove the mana Regen component on Assize and stick it on something else, an instant AoE heal is cool and all but it can't be used like that.