2nding that 5 and 6 suck ass, Rob. I perfected 5, then cleared 6 and had to redo them both because I needed to free up members.
Winning combo was:
Stage 5: Squall, WoL, Lion + Ifrit. Squall shreds the turtle, and the iguions get exploded by Renzo as you'd expect. WoL is a good battery for when the turtle hides and his EX can cover the healing. Lion has DEF down on Powder Keg and dispel on her ex for when the bosses buffed themselves at the end.
Stage 6: Cloud, Ramza, Noel + Ifrit. Had to reset through trash waves a lot to prevent breaks. Basically ignored using Ramza's ex in favor of his hp+++ to conserve turns since he hits for pitiful damage on his ex once the bosses buff a few times.
Gonna try 7 tonight or tomorrow. I cleared it already with Deuce/Ulti/Sherlotta but I was 1 or 2 turns off the score. Might go again with lillisette, not sure.