I would recommend bringing no more than 1-2 blms just because of the fact that carbuncle prime seems to laugh heartily and blms. I remember one of the times i went for this fight, the blm casted thundaga3 on him for less than 100 damage. Carbuncle healing rubie'd himself and proceeded to ignore the blm further by casting shining ruby on himself. I think smn and melee jobs are the meal ticket for this fight. rdm serve as really good kiters as well.
Back when i did these there were no cor's, but if you can land a couple of corsiars you can hit evoker's roll and beast roll for the summoners.
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