Hey all, new to this forum, been browsing it for a few years. Just received my new Cobra 4. Works wonderfully especially compared to the Boss stitcher that I have been using. Except for one problem. When I start sewing, I back up three stitches then I'm on my way. Looks great. The issue is when I'm ending my stitching run, I back stitch 3 and I have a mess on the bottom. This happens every time. I've been practicing using 14 oz and two 8 oz veg tan. Stitches look good, knots appear centered. I'm using 277 bonded nylon with 25 needle. After looking closer at my back stitches, the bobbin thread is laying flat on the bottom of the leather. I've done about 25 backstitches and none of them have worked out. Like I said, starting out the backstitch is good, only when I'm finishing off my run it does it. Any thoughts? Thanks in advance.