I don't know this machine but I feel for your frustration with it.
You may like to try a MacGuyer bandaid as a last attempt :
Remove the feed rollers off the shaft a run few layers of insulation tape around the metal shaft, then refit the feed rollers back on the modified shaft. The bandaid modification will increase the feed roller diameter an increase the feed and separation timing. I've done this with a couple of machines over the years to increase the life of the machine; when the customer refuses to buy parts or replace the machine.
You may like to post a couple of images to the forum,somebody may pickup on something for you to try.
HTH
Bookmarks