The lack of a divinity regeneration mechanic was a really really bad decision. Increasing the divinity cost of the skills and removing the way to regain it just doesn't make sense. I'm talking about the DC, i don't know about the OP.
"What if we screwed all the healers just to balance the broken dungeon we just shoved into the game for that thin slice of our ever-dimming small player base that has 24K item level or more?"