I just got a pfaff 7570 so excited because of the IDT dual feed on the pfaff and i just started machine quilting (been hand quilting for 4 years). i'm working on a project and was able to quilt a couple pieces no problem. cotton fabric on top and bottom, fusible fleece inbetween. I tried to run a straight stitch down this piece about 10" wide x 50" long and i got what i guess it called puckering. the back of the piece which is next to the feed dogs is perfect. but this is the top of the fabric that sits against the fleece that isn't fused. i relieved the tension that didn't work. i even tried to start in the middle instead on the ends that didn't work. i've redone this piece 3x getting worse results everytime. i take it off the machine and here is what it looks like. i can not figure out the problem. i'm using just my regular foot pfaff foot "0" with the idt on. so its feeding fabric from top and bottom which means this shouldn't happen! help anyone.