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Fully disassembled the lower. Deburred, cleaned and lubricated each part. Checked action of each part for function. Discovered the cause in the variation in resistance of the double action. The trigger bar when re-engaging the disconnector: sometimes it lands high on the disconnector which makes the double action pushing the hammer back really stiff, sometimes it finds a lower position on the disconnector and the action is really smooth. However this problem is unrelated to the weak blow back as when the blowback is pushing the slide back and cocking the hammer, the trigger bar is not involved and isn't causing any resistance to the blowback action. Reassembled and problem is more consistent. My symptoms are textbook rocket valve but rocket valve is 100 percent. I've spent too many hours on this cheap gun. Love the ergonomics but this last inspection revealed it's pretty poorly made on the inside. Parts are really roughly cast and tolerances are sloppy. Time to go back to a more common/proven platform that actually has aftermarket parts available. Good bye P-09.
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