I would take the Janome in again and have them restore the bobbin tension to factory settings. Then try again. I had to replace my Pfaff because the tension got screwed up somehow and was not fixable. It is ok for straight stitching, but decorative stitches and fmq are out the window with that machine. Neither repair shop could find the reason for the tension going wonky. I have a Bernina 640 now and it fmqs like a dream!