Maybe i am completely wrong and was told i was wrong in another thread but looking at this log the priest cast Heal twice. So his cheap spell was used twice. PoH was the top heal and a mana guzzeler.
Kaels cast HL 73 times.
Why would the priest not have his mana drop like a rock? If all i do is cast HR or CH i would be dry in one minute. On one fight i cast 65 healing waves and on another i cast 105. Did i do that because it was the thing that would do the most healing or the thing that would let me contuinue healing throughout the encounter?
While I'm not going to try to defend this priest's spell selection in its entirety - I, personally, would have cast far fewer non-Rapture PWS, used Holy Fire and offensive Penance, used AA at least 4 or 5 times, and probably been more careful about my PoH timing/targeting - this particular criticism is off the mark. PoH is Disc's most efficient spell, and Heal is badbadbadbad.
To use this particular log as an example of why:
The priest cast PoH approximately 42 times, by my count, outside of Spirit Shell, at a cost of 567,000 mana. The spell did 3,127,176 effective healing and generated a total of approximately 2,200,000 effective Divine Aegis (subtracting the approximate DA from crits of other spells, of which there weren't many), for a total of about 5.3 million effective healing.
The same amount of mana could have been used to cast Heal almost exactly 100 times. If he had managed zero overhealing, those Heals would have done 3,000,000 healing if none of them crit; his stats give him a roughly 15% crit rate in a raid, but he was actually running closer to 19%, so using the 19% figure and the fact that a Disc crit has a roughy 280% multiplier, (.81 + .19 * 2.8) * 3 million gives an expected output of about 4 million healing.
Basically, using PoH badly
at 50% overheal does about 30% more effective healing than spending the same amount of mana using Heal perfectly
at 0 overheal. Using Heal to conserve mana as Disc is like shooting yourself in the foot to make yourself run faster.
(note: the fact that he would have been maintaining Grace on some targets would have partially closed that gap, but only partially. If half his Heals were affected by 3 stacks of Grace, or equivalent, he would have been able to gain about 15% over that 4 million figure - still behind PoH, still assuming zero overhealing on the Heals. The only way to close the gap entirely would be to only Heal targets with 3 stacks of Grace, which isn't realistic when you're trying to substitute for an AoE heal.)