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Hello fellow leather workers - I recently purchased a techies 4800 pro, and I'm having a lot of difficulty on removing some of the tooling marks in the leather along the stitches. I have been wanting to get better with the machine for sewing basics (back-stitching, straight lines, curves, etc); however, I'm very confused on how I can minimize these marks. On the top side, I'm getting marks from the walking foot - which at this point I've accepted. I'm not sure how I could do anything further - Techsew support had me remove the walking foot rod and spring that kept tension which has had some undesirable effects, but I digress. On the bottom side, I'm getting a lot of bulge on the leather around the needle pushing through. I was told to try a smaller needle, so I've used the smallest needle for my current thread (size 20 135x16 Schmetz Diamond Tip). I was using a size 24, and the bulge isn't that much smaller in my opinion. I'm also getting marks from what I assume is the bottom walking foot, the lines are straight and seem to be part of the rectangular piece. I've sanded that piece along the edges to try bring down some of the scratches but I'm still getting this. Couple of questions, first one being a reality check. Am I having unfair expectations of my machine to leave less marks? If not: How can I remove some of these tooling marks on the bottom side? How can I minimize the bulge around the needle holes/stitch lines? Is it possible to bring down more of the tooling marks on the top side? Images of the stitches: Top side of the stitch: https://drive.google.com/file/d/1KoVdf-yPiMw0bxs0tlnH96liec4NLDYr/view?usp=sharing Bottom side of the stitch: https://drive.google.com/file/d/13rxiYevsDJ3j742raD8zXJqkQkxO9AYI/view?usp=sharing Spring cut off from the presser foot spring (advised by techsew support): https://drive.google.com/file/d/1jq1K-toKJ7K8qOnzNCWRqPOtOxDk3SCi/view?usp=sharing Rod and spring removed from top walking foot (advised by techsew support): https://drive.google.com/file/d/1XDzDcMOz6m17LSCabhr6ZEg5GgGMfUSK/view?usp=sharing If there's any additional info, I likely have it. I'm an open book and just want to become much better with this machine. I've ran back to techsew support but I can't seem to get anything further after a fair amount of back and forth on this. As with the internet, if I'm being unfair in my expectations then I'm sure I'll be told, but I welcome that. On the flip side, I look at other machine stitched leather work around my area, and I feel there is room for improvement. Leather is harness from W&C, 8oz. I've used pull-up 4oz leather with similar effect. Harness does mark much easier so I certainly acknowledge that part of all of this. Okay, I'll stop writing. Please share some knowledge and guidance!