I dont agree with you at all Zakaluka about when to use CoH;
"CoH cost increase doesn't hurt us that much - you'll just have to adjust your playstyle. Basically you won't be using CoH until you're really dumping HARD, and frankly that's when smart heals are most useful anyway."
CoH is almost never overhealing even with light damage. It's the perfect spell to actually use w/e you can. PoH however have completly different requirements, so do Sanctuary.
What is hurting Holy vs Disc when raidhealing with PoH is the much too strong Aegis, who is rarely overheal since it will last for so long that damage will for sure happen before it wears off. I would like Aegis to be brought down to 6 sec on PoH and reduced a bit in effeciancy. The PoH Aegis also rewards overhealing a lot, and God knows Disc can afford it.