Honestly I have only tried this fight with 2 whm 4 DD setup, 3 healer 3 DD will probably work if you can manage the cure on everyone being hit but i don't guarantee anything as I have not used that setup.
I forgot to mention 1 more key help
WHM sub rdm with cure clog and capped cure casting merit = releasing aga 4 in 2 sec which is a beast in this fight
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