My plumber replaced my Kohler Devonshire std height with the same Kohler toilet but comfort height. I have a vinyl floor. The new toilet is now shimmed 1/4" above the floor (the old one was on the floor). I called the plumber and was told the vinyl is soft and the toilet will rock and break the wax seal. The old toilet was not shimmed and did not leak. Was I given a phony story?