This was driving me nuts today.
First thing i picked up was that the contact between the feed roller and the separation roller was uneven.
There was pressure on one side and a light gap on the other side.
The rubber and the one-way clutch was in good condition and adjusting the spring tension did not help much.
So it looked like the rubber sleeve is pressed up against the holder edge on the near side causing the surface to be uneven but mindbogglingly to be higher on the far side.
Used a small flat screwdriver to pry the rubber away from the sleeve holder/cylinder (whatever) to spray some lubricant in there to release the
rubber sleeve from the cylinder allowing it to relax and seat flat again.
Worked like a charm and the machine is feeding again. Swapped out trays and clutches for this same problem on other machines before.
Hope it holds.
Please let me know what you do to fix this issue on these machines.