Originally Posted by
Thalur
If you go to ~28 stacks in P1 and then kite him 5 times, the second P1 begins exactly 3 minutes after the start. This means you can use exactly the same CDs as the first time, which greatly simplifies CD assignment. You should assign CDs according to P2 needs, and just use the same for P1 (e.g. Devotion Aura early so you can burn the bats during those).
After the bats are dead, healing-wise the second P1 is exactly the same as the first, so there's really no reason to go for a different number of stacks. Give your priests a mass dispel rotation, then the healers can fully focus on their job. BoP on healers is only worth it for major CDs (like Tranquility), otherwise it benefits some casters more IMO.
Just let your healers practice to get to 28 stacks reliably, then you'll have no trouble killing him in the future.