Hints from "www.aliceinstitches.com"
1) Try machine quilting with denim/jean needle size 80/12. The universal needle is too rounded and tends to produce a crooked stitch when quilting. the denim needle punches nicely through batting in even straight stitches. (interesting)
2) Try to buy unused pizza boxes from a local pizza palor- great flat boxes to store blocks and cut squares and are easy to stack.