I used a Tanio Koba slide spacer to make it work well. The inside of the PGC slide isn't machined to accept the blowback too well, and as a result, it will cant and create a lot of friction against the frame when you tighten the blowback unit bolt that secures it to the slide.
The Tanio Koba slide spacer fixed the issues for me. I can't tell by your description if you're having the same issues I had.
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