First things first, My play style as holy for 10 mans has worked great for me, as far as seeing the healing meters compared to another healer (and no not a meter whore) and how well I am doing. My guild was a striclty 10 man guild and we were successful being 11/12 in heroic ICC, but recently merged to another guild to start on 25 mans. I had always ran with a resto druid as my second healer so I was the heresay "Primary Tank Healer" But being in the gear that we have it was never an issue. But now starting 25 mans where paladins and disc priest have gone above and beyond my duties, I am stuck now more to being a primary raid healer.
My style before consisted of always FoL for my 3 serendipty stacks (not the only spell I did before I got 3 but healing the tank that what I used most) while then using that cooldown to dump a Prayer of healing and then a circle of healing onto the raid (again only 10 man). I had loved haste up until this point i believe. I have 720 haste self buffed which is a 22% spell speed increase, and I am gemmed all Sp and Haste gems. But now being in 25s I think that my "play style" isnt what it should be now and instead of FoL and then Prayer of healing, I just spend most of my time throwing out renews and coh and mendings and never really touching FoL until a Surge of Light procs. So now is all my haste gemming worthless? or should I replace with a different stat now?