I have a Pfaff Grand Quilter and have used it quite a bit for FMQ, it is not on a frame. I've just bought a walking foot for the machine because I have a lot of straight line quilting to do, but I'm having a problem with the back of my quilt puckering and I've had to unpick it a couple of times and I've now totally re pinned the quilt hoping to get a better outcome.
Do any of you knowledgeable people have any suggestions for me to make my task easier. I have the same thread top and bobbin, it hasn't been breaking and the tension looks good. Could the problem be the pressure level on the foot? I have tried this on almost every setting with no luck.

I don't have a Pfaff dealer near me, I phoned one today but they really couldn't help. I don't want this to beat me although I'm tempted to do the job on my other Pfaff machine with the built in IDT.

I would appreciate any help or suggestions that you may have - the quilt is one that I got from a link on this site and I'm looking forward to posting photos of the completed job.

Cheers and thanks from Oz