Ok, so I am a holy priest with full t7,5. The thing bugging me is: my raid-healing holy colleague seems to be holier than me when circle-of-healing. Much, much holier! I'm hitting my circle button (with glyph) every 6 seconds whenever somebody is taking damage in combat (even if just to get an instant flash heal), and so does he. Both our overhealing is minimal. Still when the battle is over his circle has healed not only twice or three times the damage mine healed for, but up to FIVE times! This adds up to a monstrous amount of damage healed. So how is he doing it? He is taking this for granted and cannot explain to me why this is so, while for me circle always was just a convenience, healing-for-almost-nothing spell.
While I'm generally not judging healing by dps- (or rather hps-) meters, this huge discrepancy in efficiency I cannot ignore. What am I doing wrong here? Are there trinkets I should get (no trinket luck at Naxx yet)?
Could it be the crit rating? My own crit is only 12.5%, while he has twice that much.