My toilet flange seems to be too high. It is 1/2 inch above tile on one side, 3/4 inch on the other (including the flange itself). When I dry fit the new toilet, it rocks a little. I believe it is resting on the flange and rocking on it.
So, I guess my only option (short of digging it out) is to build a toilet plate. I have seen plywood mentioned, but is that wise next to tile and in a bathroom? I have some hardiboard left over from another bathroom project, could I use that instead?