I got to 80 leveling as shadow and dual spec disc healing pugs. I geared up doing mostly random heroics, weekly raid quest and VoA. I don't really have much experience at all raid healing since vanilla.
I saw someone LFHealer for ToC10 the other day and thought I would give it a try. I've done ToC before as a tank and DPS and know the fights fairly well and my gear shouldn't have been an issue for that level. For whatever reason it seemed really hard, I guess it was because it was a new experience to me. In 5 mans I mostly keep rolling shields and sometimes renews if I know its an aoe damage pull or if a particular DPSer gets agro consistently.
In this group I found I was going OoM keeping shields up on all 10 people and most fights don't really require them. The group pointed out my low HPS compared to the pally that was tank healing, although I noticed the tanks getting to 50% health at times so I tried to keep them shielded and renewed. I know its hard to 2 heal pugs but it was just frustrating trying my hardest and being blamed for low HPS even when people weren't dying.
Armory
Stats are (unbuffed) 2142 spell power, ~25% crit, 350 haste
How am I supposed to be raid healing in pug 10 mans as disc? Is it just shield then flash heal whack-a-mole? How importatnt/helpful is it to dual spec holy/disc for serious raiding?