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I own this model of AK as well; your problem does indeed sound like the mags are not quite a good fit and are pushing on the hop up chamber, forcing it out of alignment and creating an air leak.
I would recommend replacing the hop up unit and as well shaving some material off the offending mags locking hub to provide a correct fit. I had the same problem with G&P mid caps, disappeared once I took about 2mm off the rear hub.
Cheers
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