Unless it is a gift for someone, I would not worry too much about being perfect. After all how often is a quilt laid out with no wrinkles in it, if it is being used. I am not refering to a quilt that is on a bed that is not slept in. Like I told my daughter when she was little and I made her dresses, if I was not happy with the hem I told her to "just keep moving" no one will notice. Just do not lay the quilt out flat if you can not work out the problem and it will bug you. Or donate it, the receiver will be thrilled for the gift of warmth and beauty.