Just crossed my mind an idea like this one:
I've been convinced that COH is OP but the real reason of it's opness is that heals more then healing punctual every of the 4 targets(glyphed).
How about this kind of nerf:
-CoH remains without CD.
-CoH will heal a bit less, but will leave a hot on it's targets wich can tick for like 10-12 seconds. If you use again CoH it will refresh the hot. But if you use some other spells like renew, it will add up with the hot, wich will be refreshed.
At this point, initial heal of the CoH will do less healing, but the result will be like this:
Every priest healer will be tempted to use Coh like once every time they finish to refresh renew on the targets that they previously healed with CoH.
I believe will be really nice, as after spamming 2 3 cohs they will be ocupied with "refreshing" the targets that were previously touched by CoH, and maximize the healing on that targets. I believe that this would make game much more interesting, and let me tell you a secret: CoH is the second spell used after the druid Hots wich are like the "first damage takers", so this makes it fair to have to work a bit for it to maximize the healing that can be output using CoH. (CoH is second best in game by the point that can heal the fastest a player/more players after the druid hots wich are first that are dealing with damage taken)
If you get more healing from this then spamming CoH, and you can also save alooot of mana like this I'm sure the maximum use of Coh Will be like 2 3 cohs folowed by alot of renew. The fact that Coh heals less at start and leaves the Hot wich will be removed and reapplied if Coh is used again, this will prevent priests from using it continuously, as it will heal for only the first amount of heal
I can't think of any other way to make holy priests more interesting, what do you say? (not to mention the part with using addons for knowing who was touched by Coh ) - ofc if you think my theory is broken pls say, I just came with the idea and I would like to see if is viable or not, at least from theoretical point of view.