FX Fx impact M4 plenum (male/gun side) leak issue

I have an fx impact M4. It's a 35, but currently I'm running my .30 cal 700mm.
Has anyone ever had leak issues on the male end connector of the plenum? The part that mounts into the gun via screw clamp. It has two 9mm x 1.5mm o rings. I have never really had a serious issue with this gun in the months I've owned it. But this is the 3rd time now that these o rings have gone bad or caused a leak. Does anybody know how tight that clamp screw is actually supposed to be and what would cause this constant destruction of o rings/ leaking issue? It's a very hard subject to find info on and I'm hoping I'm not alone here. Thanks to any body that can contribute here. Everything I know about airguns I've learned in the last months since I've owned this impact. I can now tear the gun entirely down in about 5 minutes compared to the ,20-30 it used to take. But this whole plenum issue is currently what I really want to get a proper handle on. Here is a photo of what I'm speaking of, and yes I know it's missing an oring in the photo.... Lol
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Watching with great interest. I have upgraded my MKII with the newest PowerPlenum and cannot seem to get these little buggers to seal either. Hoping someone here has a secret they are willing to share.
Well rdtricks, looks like it's just us. And my solution this far is this. I've ordered 200 9mm o rings and talked to a seasoned, legendary fx guru a handful of times. He says when replacing these orings, slide part from left to right gently while entering rear gun at clamp screw because those edges can easily catch your new orings and scar them upon entry. I'm still waiting to hear about exact tightness specs of clamp screw. I will post again when I have this things all back together again. I am surprised more people haven't had this exact issue though.

Cheers