Hello,I'm stitching out a design on some vinyl material kinda like leather just softer pretty thick. Well my design stitches very nice when satin stitch is going down/right, but when it starts to stich on its way up/left. It loops real bad missing stitches like if there were no bobbin inserted. But as soon as design is stitching downward it does very good. The width of my column is about 3/16" at it's thickest point. any ideas. Thanks!