It'd be really nice for Ninja players doing roulettes if Hyoton got a buff:
+300 potency while under the effect of Kassatsu.
This would make it so players don't have to check whether the dungeon roulette they're running is 50-75 or 76+ when working out what their better use of single-target Kassatsu is. They could just know that Hyoton is the single-target thing to use with Kassatsu.
I know the shifts in rhythm are present in all the classes - Black Mage arguably most of all - but this one feels really egregious and worst of all it's largely invisible until you misuse it, unlike other job buttons that are grayed out.