I know you will get tons of personal preferences but I could not get a decent back on my domestic sewing machine until I started using Hobbs 80/20 fusible batt. I have done up to a twin size quilt with no puckers. I imagine that if you use the 505 fusible spray that you would get the same result with no wrinkles. I can't use sprays due to allergies. I also found that polyester batt slips more than cotton or cotton blend batt. Just my opinion, some people love polyester. Try a few different things and find out what you like best.