Another idea for quilting would be to sew diagonally from corner to corner making x's through the squares. You can start at one corner of the quilt and sew to the other end. You'll be able to quilt with fewer starts and stops. On some it even gives a look of lots of smaller triangles in the piecing. I don't have a walking foot and have had good luck, but the two I did had a backing with a lot of body in it and very little stretch.