My character is "Notmorei" in this High Imperator (H) log: https://www.warcraftlogs.com/reports...f#type=healing
Gear:
I'm mainspec shadow, and I gear Haste/Multistrike so I can use the Multistrike for holy when I need to heal. I have 1157 spirit in my "healing gear" (a 615 spirit trinket, 630 spirit neck, 608 legendary cloak from last expac, and 680 spirit ring). The other priest in the group said he only has 100 more spirit than me, so I'm certain it's not a gear issue.
I tried out different talents throughout the night, I ended up going with Solace, ToF. I never bothered changing my lvl 100 talent because the other priest had said WoM was the only one worth using for holy, but the h2p guide says CoP is good, so I might try that out next time.
My basic strategy was to Renew people who took a little damage, or just renew spam before force novas/abberations etc. I used WoM in a similar manner, and saved lightwell for big aoe phases as well. I'd CoH as soon as a force nova went out or when the whole group took damage. I was playing very conservatively but still ended up with mana issues AND crappy healing. I'd switch to Chastise and just smite/chastise the boss or add when there was down time (basically p1 and p2) to conserve mana/dps something. I switched to serenity at times when the tank was getting trucked. I can't remember if I was in Serenity or Sanctuary at the end.
Why is my hps so much lower than the other priests? Is this something I can fix with practice?