I've had the same thing happen to me, but I ran out of rubbers to test the mod, so I don't know whether its the problem.
On the bottom of the nozzle is the bb loading arm, right? If you look at the underside of the arm, you'll see that the bottom starts out flat, and then there is an abrupt change in direction and it starts sloping downwards towards the gas chamber. Take some sandpaper and sand down that abrupt angle change, and see whether it helps.
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