When I had to do miter borders on a queen size quilt, I always had to go back and fix at least one corner. I measured twice but didn't cut, I basted the corner until it was correct. I was so angry that all I wanted to do was let out a very loud scream but I didn't want to scare my dog !! Wish you had posted a picture. Usually when I hit the wall with a quilt, I walk away and do something else even if that something else is HOUSE WORK !!! I find I clean faster when working off my anger !!
