Saved myself. Pulled off adaptor & cleaned. I also cleaned out the slots in the floor flange to give the wax more volume. For some strange reason, I had jam nuts on the flange T-bolts to hold them in place with the old toilet. When I trial fitted the adaptor, I thought they cleared those jam nuts. But, I removed them for my 2nd attempt to install the adaptor. Then I used a simple wax ring w/o a horn. Bottom line, adaptor installed flush to floor.