I, too, must be missing something. I always do a 2.5" binding unless it is a miniature or doll quilt. It ends up being about 3/4" after all the folding and sewing. What is to prevent you from turning more of the binding under when you sew it to the back? I guess I am more of a self taught quilter who doesn't know all the rules for doing it "right". I always try to do my best to the best of my knowledge (however, that is limited). I know you can make this turn out just fine. Just MHO