I have odd stitches too. I am also wondering if the quilt batting is creating any of these problems. I am using Hobbs 80/20 and it has a 1/8" loft. We used to be able to buy sewing machine needles in a red package with a blue top and some foreign name on them. I had one jean needle that worked perfect in my treadle 15-91 but I can't remember the brand and don't see them in my shops here.