Replace one of the Monks with a BRD, and You'll win pretty easily.

Have SMN use Ifrit's Enfire
BRD Soul Voice March or Minuet (if they're using Hundred Fists, Then Minuet)
SMN then uses PD > Everyone rape

The enfire really is the key, nearly doubles your damage because of his per hit cap.. My group was pretty meh, But we won by the skin of our teeth. Zerging is a bit difficult, But it doesn't even require MNKs.

WAR with Ridill/Joy/Axe/etc Would work, Even M.Sword
DRG or SAM with a Quint Spear
DRK with Bahamut's Zagnel

So even two handed jobs have the opportunity to be useful, Especially if you can get a BRD for Soul Voice March. MNK, THF, Etc work wonders cause they have all 1 handed weapons with high skill in them, So they don't need much maint.

I mean, the fight is a little rough, But i think everyone has a chance to win, Pretty much any jobs can work so long as they aren't DERPBROS. Even PLD/NIN can work in the Zerg, Dual Wield/etc. Use Vorpal Blade, Joyeuse Offhand.