My fiance and I are putting the toilet back into our small DIY bathroom redo. Same toilet that came with the house and the plastic flange on the floor is the same too, as it doesn't appear cracked.The bolts are new, bought with the wax ring. We tiled the floor with slate, being careful to put our most even pieces in that area. We've checked the floor in that area all over, and it appears level. But, we've tried two times with jumbo wax rings (to compensate for the slight height the tile added) and we still have rocking. The rocking seems to be diagonal, ie not exactly front to back or side to side. Are we missing something? Where do we go from here? Take up the toilet and set it on the floor without ring to see if we notice gaps? If so, what do we build it up with? Guess this also means yet another trip out for a wax ring, huh? Thanks in advance.