way to keep it constructive oh wise one...
what was that about causing problems?
*shrug*
its a learning curve, im slow. im having a difficult time as it is, i REALLY need shit from you, you know? it just makes everything more awesomer.
i am, JM5K
Depends on the fight, and group makeup. I've been alternating between holy/shadow-
I've been using 6/33/2 spec.
I need to reglyph divine spirit into lolwell, but with poh/renew as primes, coh/mass dispel/dispel as majors, i was pulling like 11k-13k overall during the magmaw fight (depends on how bad people were being at standing in shit), and never went oom until the VERY end (1 resto shaman for mana tide).
Pop your mana abilities on magmaw early, first head phase is a great time, stop healing completely before the second head phase (if any dps are damaged entering that, they should be using the f'ing lolwell), by the 3rd head phase both are pretty much up. Head phases are also great for mana regen period.
On omnitro, you have to be riding archanotrons ass so the second he drops his mana pool thing, you are standing in it (1000 mana per second?), its part of the mechanic, and same thing with popping mana abilities fairly early, you get 2x of each per fight as a rule).
Gearing is pretty important, everything has to have spirit, or its a bust. I'm all ilvl 346 in healing, with the exception of my pos wand. I use the +300 spirit flask, and the +90 spirit food, everytime.
Make sure you have timing down of his aoe abilities, and we've been having ranged group up, so my white ground healing spell hits the maximum amount of people (as does healing rain, and the druids green ground healing).
Besides staying in aoe chakra the whole time, its really not hard. PoH hits hard, and with a decent amount of mastery (and glyph) it gives a pretty good hot on top of it. Make sure you are in a group with a resto shaman, we get a huge mp5 boost from mana tide (moreso than the other healing classes I think, we have the most in combat mp5).
Magmaw is an awesome priest healing fight, and omnitron has its high moments where we really shine too. If priests aren't outhealing druids and shamans every time on aoe fights, you are doing something wrong ;o Paladins will beat me every time on trash as a rule, or non aoe damage fights (haven't seen one yet really).
edit- from looking at your character sheet, why so much mastery? EJ has you "stacking haste until 12.5" so renew gets an extra tick, but fuck renew. Mastery comes on gear, but more haste = more casts period. I've had great luck with alot of haste so far.