My friends and I do this with 4-6 people.
THF - in using haste for shadows/ eva gear between casts
RDM - slow2, para2, addle, blind, bio3, poison II
WHM - main heal/ pro V/ shell V, auspice, haste
BRD - March/ Mambo
BLM - Stun, elemental dots, light nukes
COR - QD, monk roll (subtle blow), nin roll (eva)
It's just a slow steady fight with that setup. Obviously the more experience + better gear/atma/abyssites people have the easier this goes. TBH it'd be easier than you think. Just take care to stun the worst TP moves and keep the HP of the THF topped off.