I used tank + 4 dps hybrid heal until max level. It did work pretty well and I was not shifting more than once per pull so passive mana regen worked great. It was not working as well at max level, so I am trying the single healer + 3 dps approach instead. It is nice because the tank health is not as much of a roller coaster, and dps is actually close as I do not miss any energy ticks on the cats and they get more chances to proc omen of clarity for a free shred. Maybe once my gear is better I can try 4x hybrid again.
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