I personally don't pay attention to my ac. It's generally at or close to 1100 and I go max hps basically all the time. The more hps you have the better your mends will be and that's huge for soloing, grouping, and raiding. Raid buffed I'm within a few hps either way of 4800 so that's a free 1200hp heal every 6 minutes. For fights when you have to deal with an ae that's a huge help on a healer's mana bar.
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