You did say 30 seconds earlier which is what I was going by.

We normally see 2 clones. As soon as we realised he spawns more clones at a lower % we changed our strat to hold back until after he clones.

Our current strat is basically

4x DD COR SMN
4x DD COR SMN
SCH SCH BLM BLM BRD/BLM/SMN BRD/BLM/SMN (Last two slots pending on how many people we have)

Give the 2 DD parties PD + Haste + Embrava + March/Min/Min/Scherzo (We know this is Haste overkill. It's in case he dispelgas some away)

Have the DD's hold back until he clones. Then 1 party on each clone with BLM's AoE nuking and tossing stun at their designated clone if its up. SMN's use the Ramuh stun BP.

And I don't think we'll be able to do much more than that unless something new is discovered about him or new strat is devised.