It's hard to know if the bobbins wind evenly on my machine as I have to crank the servo up to the highest setting and then nudge the bobbin with my fingers to get it going, sometimes it'll stop in the middle of winding and need a nudge.
That's with the tension all way off on the winder but obviously that's too loose. . .
You can see on these pics how the stitching on the thin stuff was fine (around the zipper, middle of the pockets, along the side between the pockets) but the moment I added that outer layer all of a sudden it goes to total shit. . . That outer layer is about 5oz vegetan that's dyed and finished so nothing new or surprising or bizarre.
If I take undyed pieces of all this leather and stack them the machine performs perfectly. I'm really stumped. This happens both when I glue the pieces before stitching and when I used sew through basting tape. . .