I'm installing the adptor to the floor flange. The floor flange is on top of the finished floor. I used a standard thickness wax ring with a horn. In tightening down the flange bolts, I think the bolts are tight enough, but the plastic adaptor is still 1/16-1/8" above the finished floor, both at the flange & the 4 screw "wings" of the adaptor. Now what????