I don't know whether this will help but with every quilt I've ever made, I reach a point where I just hate it. There is something that I could have one better, would have done differently, should have been more careful about. And then, I finish it, knowing where every little flaw is (and feel compelled to point them out to people). It's just something that some of us do. Try to quit beating up on yourself. I'm sure your quilt will be beautiful and, trust me, people will never notice the things that are driving you crazy. You'll figure this problem out. Just be gentle with yourself and give yourself a little time. If you have a quilt group, take it in. I find that the women I quilt with can almost always come up with ideas for a solution.