So, after spending about 2 hours, reading over many posts, doing some math here and there, I haven't gotten an answer yet.
This is what I have picked up.
-Mastery scales poorly with PoH, but great with PW:S
-Haste is better throughput on certain fights, but is often wasted if you aren't chain casting.
-Crit makes your DA stacks huge, and is a good stat to balance.
There still hasn't been an answer. My healing comp consists of a resto druid, a resto shaman, and me a disc priest (holy on alysrazor and baelroc)
Here is my situation. I find myself rarely tank healing, and if I do, it is just pennance, PW:S, and PoM. Flash heal for omg heavy tank dmg.
I'm the person raid healing, I often over heal with my PoH, but never find myself ooming. I finished Ragnaros with 90% mana... The only fight I come remotely close to ooming, would be Domo.
As of now, I am stacking int everywhere I can. Reforging all into mastery, with low haste, and low crit. Here is my stats.
I have 2p t12.
Spell Power: 8252
Haste: 4.01%
Combat Regen: 2796
Crit: 12.28%
Mastery: 19.06
Also, this is probably a dumb question, but since I'm not ooming, I'm assuming I should use inner fire, however, I find inner will's movement speed increase is extremely helpful in many encounters. Thoughts?