I managed to get Isgebind down to 5%, and Tiamat ~20% after revising my strategy. Isgebind would have been a win, but I may have fucked up. Not a big deal. Tiamat was a lot of good RNG, lol. I tried the no healer Raijin strategy, but besides Squall, Ayame can't put out DPS fast enough. Maybe if I dive Edea, but I'm reluctant to do so since her dive is kind of mehhh.