Well honestly with 5 other throughput healers in your raid I would have gone Discipline
But as Holy...
I would definitely replace Glyph of Prayer of Mending with Glyph of Deep Wells (PoM glyph reduces overall healing if it gets fully used, and in your 27-man raid, it definitely will).
I would consider replacing Glyph of Binding Heal with Glyph of Circle of Healing (gonna cost more mana, but you should have plenty of targets to hit) - you didn't actually use binding heal at all, at least in that Kargath kill. I'm aware of the binding heal x 2 ---> prayer of healing combo, but it's still mana inefficient compared to renew/coh spam, so unless something goes horribly wrong you shouldn't need to rely on it.
You should cast Prayer of Mending
much more often - in fact, you should be casting it on the tanks on-cooldown unless there's no raid damage going out at all for 30 seconds, which I don't think ever happens this tier...maybe on Brackenspore between infecting spores...
It looks like you're using a lot of single target nuke heals - Heal, Flash Heal, Holy Word: Serenity. You really shouldn't be, unless you're explicitly assigned to tank healing. On raid members, there is basically never a situation where you should be casting Heal instead of Renew. An important thing to realize is that fights have (largely) been designed differently this expansion, such that unless they are
soaking some powerful mechanic (intentionally or otherwise), a non-tank raid member should never be in danger of dying full-to-dead in less than like 15 seconds. The healing mentality from previous expansions as been to panic and nuke heal everyone as hard and as fast as possible because they might not survive the next pulse of ridiculous boss damage. Now, both damage taken and healing has been scaled back considerably, so people get hurt slower, and you heal them slower.
Basically what this means is you can (and should) be relying on renew much more heavily than any of your other spells.
I gotta run, but I can expound on this later.