I'm quilting an aggie tshirt quilt (which I've done lots of tshirt quilts on Millie), however, on 3 rows I get these odd, top thread breaks on the back of the quilt. I'm using So Fine clear Monopoly on Top, Bottom Line thread on the bottom. the customer choose Hobbs 80/20 cotton (which I've used before). I have a bobbin case that I use with Monopoly thread that is a whole lot looser than what I normally quilt with. I've changed bobbins, changed needles, cleaned and oiled everything, checked my check spring, loosened the top thread tension, tweaked the bottom thread tension, shortened the le