My advice will go against the group's. If the straight top bothers you now, it will always bother you and you'll wish that you had made the change. But: I would follow SewGarden's advice to pin the change on the quilt and live with it for a few days. You may find that the quilt is already perfect. I think it's beautiful and love the fact that there are no straight block lines - what a project this must have been!