If I understand correctly you are saying there is a wider strip of binding on the back than on the front when you wrap it around, right? I had that same problem so started cutting my binding strips 2 1/4" rather than 2 1/2". That little bit seems to make it work out for me. I usually stictch my binding to the front by machine then hand stitch the back. I may try the suggestion of machine stitching to the back first and pulling it around the the front and using a decorative stitch to finish it off. I like that idea and it would SO much faster!