Fives at 76+ is a pain. I find that I need 3 close to full health characters guarantee a win. I will say though that full health Savage + Lumi vs. Full health 5s is a win for Savage and Lumi 100% of the time. Savage gets one crit with is basic all of the sudden 5's is hitting for 1k. And Savage gains turn meter and offense up on attack so if things go well you can attack faster than 5s. At 76 Savage's basic hit for a decent amount (based on being 30% more than what he hits for at 75 level 7).