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If you haven't already checked your loading nozzle/muzzle i'd check that over really well. My G17 had the same problem as yours, venting gas and not blowing back far enough.
Turned out the loading nozzle had a crack in it. It was replaced and everything worked perfectly.
You can also test the space between your mag and loading nozzle by just pressing up on the mag and shooting the gun, see if there's much difference.
Kudos to E for the detailed write ups.... I liked reading your analogies... lol
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