I almost always use 2.5"--easy to do with my Accuquilt too. I double it, sew to front and flip to back and blind hem stitch down. Sometimes I will use a 2.25" width the same way--especially on a wall hanging or table topper. I almost always trim my quilted quilt with about 1/4" (or whatever squares it up close to that) of bat/backing left on to fill the binding. When I machine stitch the whole binding, I still stitch to the front and flip to back and actually use pins rather than clips to keep it right where I want it since I can't see to adjust like hand sewing, and will just catch the binding (or use a flange--super easy and looks good)right next to the "ditch"--or use a decorative stitch and center it on the ditch. If you are having problems with getting the final join on the binding to work with no bump, check out Fons & Porters YouTube on it.