I just tiled the floor in our master bath. The closet flange is now ~ 1/2" lower than the finished floor. I bought the extra thick wax ring, can/should I use this or should I purchase the flange extenders? I found some rotten sub-floor under the toilet and don't want to repeat that repair. I may purchase one flange extender depending on thickness and still use the jumbo wax ring. I also noticed the drain pipe is not straight up and down. It's is pitched ever so slightly. This is making the closet flange slight off level. Will the wax ring deal with this? It isn't off by much, but enough to notice.
Ideally, a toilet flange should be bolted to the top of the finished floor level with only the thickness of the flange above floor level.
If the bathroom is over a basement or crawlspace, I would cut the pipe and raise the flange to the proper level. If it's on a slab or an upper floor, then you can use extenders or doubled up wax rings. When I have to double wax rings, I use a regular ring on the bottom and a wax ring with a plastic horn on top. The wax should seal any slight unlevelness (if that's a word...lol) of the flange.