How do you meet the accuracy requirement for endgame raids?

[LionKing]

In T10 go T13, if you, as Healer, had any spare time to DPS plus fulfilling your Healing role, you,sir, would have my respect to you.
If you really need to DPS just to meet the DPS check in t10-t13, I say your DPS team is struggling.
Plus to meet the Acc requirement in t10-t13, you must sacrifice some Points on Pie,Det or Crit, which in turn, lower your healing capacity, hence I would not really recommend trying to meet the Acc requirement just for the sake of some extra number.