I don't mean this in a rude way at all, but I looked at your LS roster, and no one has the classes leveled that you'd probably need.
You need 2 THMs with everything 50, except MRD, and you need a GLD with everything 50, except THM.
You also need Bowmanship, Pikemanship, Swordmanship, and One with Nature (not to mention the standard staples like Prime Conditioning and Fast Cast).
Emulate has no [noticeable] effect on any version of their bomb toss (including Hail Mary).
Everyone must have Twisting Vice up at all times, and Bloodletter when they have 2,500+TP. The Pikemanship is crucial for Invigorate II.
Timing of Decoy is crucial as well, seeing as every being hit by non-100% resisted Toss (which can happen) is at least 3,000 damage no matter what without Sentinel active.
Aegis Boon II does nothing in this fight, nor does Outmaneuver.
Deflection is mildly effective, but often resisted without Sentinel up.
Timing of Diversion is also pretty crucial, another reason why Pikemanship shines here.
Bloodletter DoT only resolves for 400 DMG without Bowmanship, and Decoy's recast is 30 seconds longer, which is clearly a huge deal without Bowmanship.
Stamina is a huge issue in this fight too. It could be duo'd without any exploits too. Me and a friend were able to duo it a few times out of about 25~ attempts, without any fishy business, not even suicide Barbs.
This was all done by a few of us from
http://www.ffxivpro.com/linkshell/Selbina/OhYatsu/