I'd actually love if Pay Pay and Ulti's true strength is seen when they attack together. I don't want them to be Blueno'd but at the same time, Luffy should not be struggling with F6 level fighters. Even if there are two of them.
The good thing however about there being so many zoans this arc is that opponents can be recycled. Luffy can molly whop pay pay, but because of his zoan regen, he can be back up and ready to fight again shortly.