15 months ago we renovated our bathroom. Approximately 3 months ago we noticed a "snap" like sound when we got up off the toilet. We put 3 stainless steel washers (3/8" diameter ) under the base of the toilet. They were sticking out a bit at first because of resistance . I was able to push them in further so they don't show now. Should we caulk around the base of the toilet now(the contractor did put a ring of caulking under the toilet base when he reinstalled it)?