On contrary to what most of MTFs think AO surface is not that higher bouncing. It stays pretty low on slices and flat shots. High bouncing HC are only IW and Miami.
No. Miami has a medium bounce and there are other tournaments that use high bouncing surfaces. I am sure that there is/are still surface(s) that use Rebound Ace. IIRC, Australian does take slice well and it also has a medium bounce.