I've seen aftermarket mounting screws be a little too long and jack things up slightly. I had a friend with some sort of aftermarket Cyclone and it took me a good long while to realize what was going on when it would feed intermittently. I would look into that, and I would also check that your gas line is unkinked, your pistons and ratchet are oiled and also that your paddle screws aren't overly tight.
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