What kind of material is it? If it is Batiks, it may be the needle. I quilted a Batick quilt once and had some longer stitches until I changed the needle to a smaller size needle. I normally use a size 18 needle on my PQS Freedom but if I do a Batik quilt, where the material is tighter woven, then I switch to a size 16 needle. It is certainly worth a try for you to switch to a size smaller needle than what you have in your Nolting right now and see if that solves the problem.