When using your embroidery machine for quilting don't go through the extra finger or loop on your bobbin - that makes your bobbin thread tighter - you want it more for sewing. Also you will want to change the tension - I check what the tension is for regular sewing, then when my embroidery unit is ready to stitch I change the tension to match the sewing tension. This keeps the thread from drawing to the back. Don't know if this makes sense but it makes a world of difference on my Bernina.