What a beautiful quilt. I have done several bias edge patterns and have had to square everyone. I have 12 inch tiles in my breakfast room/kitchen so I like the edges up with the tiles and tape it down with masking tape. It's not perfect but it works. Then I totally wet the quilt down and let it dry. It usually works. I am looking forward to trying the Elmers glue basting to see if that helps with "poofs" that appear in the center.