Good grief dude. From what I've read you don't have a clue whether the problem is actually originating at the PCU or the fuser. Seems like that should be your next step. Divide and conquer!
Make a copy of a good original that will highlight the CQ problem and try to stop it at various points (open a door to cause it to jam and stop). It may take a couple of tries or it may take a hundred. But, eventually you should be catch it at just the right point to prove what device is causing the issue. Then, we can narrow down the actual causes of the poor CQ.
Sending the sample copy is a big help when it comes to diagnosing the problem. Including a scan of the original of the copy would be even better.
Good luck.
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