I agree, get a add on flange that will sit flush with the top of the finished floor. Also I have had problem with the wax ring and the (black insert) inside the wax ring. You can trim off the bottom of the black insert and fit it to the new flange. My best results, put the wax ring on the Floor Waste flange first. The balance the toilet over the 2 brass stems and let it down slowly. That way your are directly over the "hole" your stems are lined up. Press around the toilet and even sit on it! Then assemble your washers and bolts, cut off extra stems and snap on cap.