Cleric Stance needs a buff

[Assirra]

My SCH literally has to throw everything he has at a basic lvl 57 enemy and it takes over twice the amount of time it would take a summoner

Well that is how it is supposed to be.
Cleric stance is a tool orginally dessigned for WHM so you could actually level as one from the start. SCH never actually needed it cause you could switch to smn but for some reason they still had the ability to cross class it.
It was never designed so healers could do the same damage as dps while still healing with a switch of a button. Otherwise why would not just bring 6 healers and 2 tanks?