From the in game research i've done on this there are two way's of doin this, the easy way or teh really easy way.
really easy setup;
NIN x 3
WHM x 3
each pairs off to 1 mob each an NIN solo's with WHM haste an heal support.
* NIN magic is fairly strong against these mobs.
easy ish setup (with right people);
PLD
NIN
WHM
any DD
RDM or SMN
RDM or SMN
kinda harder to do with this setup, the trick is for the RDM's/SMN's to kite 2 while the other 4 take down one fast, you can change one of the RDM's/or SMN for another DD an have the PLD keep one occupied untill first is dead but help PLD 2nd rather then kiter.
Xenon