You've received some great ideas to try but no one mentioned the batt. Polyester batt will be trickier to machine quilt. The fabrics tend to think polyester is their own personal skating rink. A conbination cotton/polyester or cotton batt grab the fabric better and shift less. I like to use Hobbs 80/20 fusible but a lot of people prefer the 505 spray basting. Good Luck!