Hi there.
So I'm no expert but after looking at your armory, I figure you are going for the crit build. That is totally viable and a good way to go. I would possibly suggest going mastery for this fight because of all the movement. Then again, tank healing is critical in this fight.
In regards to your talents, I would probably go with Holy Avenger if you are crit.
Here is a link from our heroic kill last night.
https://www.warcraftlogs.com/reports...Y#type=healing
Flamefur is a pretty damn good holy pally and parses VERY well. He stacks mastery. Hopefully this can help you out a bit. -
http://us.battle.net/wow/en/characte...mefur/advanced
Granted he outgears you by a fair bit, but at least you can get a guage of where his heals are coming from with the mastery build. Remember though, that mastery is more of an aoe raid heal spec, whereas crit is more of a single target tank heal. His numbers may be bigger because of all the AoE healing he is doing.
Feel free to sift through all of our logs to check what he's doing on a per fight basis.
https://www.warcraftlogs.com/guilds/1541/
Hope this helps and have a good day!