The walking foot is not meant to be used with free-motion quilting, only for straight sewing to help the top fabric feed evenly with the bottom fabric, so take that foot off as most are bulky and will restrict movement of the quilt. Your needle position should be set at zero with the feed dogs down. Try using a normal foot, or an open-toe one. If you still have problems you may have to get a 'hopping' foot, which has a spring, so the foot bounces as it stitches. Hope this helps some.