FX Need help with moderate leak

Hello friends,

I have developed a leak on my FX Dreamline classic. I currently lose around 15-20 bar every 24 hours. Recently I made adjustments to hammer spring, added a power plenum. I did de-gas the tube a few times via the screw on the newer style regulator. (Photo below) I did this each time I decreased REG pressure during tuning setup with new 600mm barrel to not damage the REG internals while turning it. I did run into this "de-gas" screw leaking once after adjusting REG and refill. It was just loud enough I could hear it. I had to tighten it to what I feel is "too tight" in order to get it to stop. Or so I thought. Do you all think it could potentially still be bleeding air? Or could I have messed something else up? I did very minimal work on the rifle. Power plenum was installed with new O-ring and silicone grease. Any insights are appreciated. Thanks!
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