I have begun basting with a large stitch around the quilt edge before I start putting the binding on. It does keep the back in line, but occasionally I end up with a little pucker at the end of the binding process. (I bind by machine; can't hand sew anymore)
I think the pucker is because the binding is still a little stretchy, but the basted edge of the quilt is not stretchy any more. I might need to apply a little more tension to the binding when sewing it on.