your loss of compression screams "nozzle/tappet" but if you say it's ok, well look elsewhere. is the nozzle moving when you fire the gun in semi? turn it upside down and look into the feed tube on the hop chamber and fire in semi. the nozzle should move. also, is the piston head o-ring still in place. if you can take some pics of it and pm me i can see if something catches my eye.
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