As previously mentioned do try and file down the rails a bit to make everything fit. I didn't have any blowback problems with my PGC metal slide when I first installed it but I did have a lot of fitting problems. One of the biggest sounds similar (if not identical) to the problem you're encountering with manual cocking except my gun would lock the slide further back than the slide catch could engage. It turned out to be a nub sticking out inside the slide which was catching on one of the sears. This would happen both cocking and firing the gun. If it sounds familiar to you let me know and I can take some pictures of the solution I worked up.
One thing that your post brings up in my head is
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Originally Posted by Valcrow
Right now the chamber slides back and forth freely almost not touching the piston head shown.
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The nozzle itself when installed in the gun should not slide back and forth freely since there is a spring which should return the nozzle to the "home" position which is towards the butt of the gun. If the spring is missing (I know I've left it out a couple of times when re-assembling) then I'm pretty sure you could get the sluggish blowback you describe. Anyways, just a thought.