That's what I'm going to do is add some of the sashing/border fabric in there to straighten the edge. My wife told me when I showed it to her that people aren't going to pick it apart, they're just going to enjoy the quilt. Me, I know it isn't going to be shown but I still want it to be right. At this point though, I know I would do more harm than good if I took it apart to try to fix it.
Rodney