Is the rest of the quilt perfectly square, inside that border? And what kind of quilting is it - allover, or perhaps that outside border is quilted with a separate design so the stitches don't run from the inside into the border? How intricate is the quilting? Sorry so many questions, but the answers might help with a solution. A picture might also help. Sorry you're going through this. It must be very frustrating for you. I also realize that it can be hard to keep a quilt square, something that I'm sure professional longarmers struggle with all the time (and one reason I'm not a professional!)