Suppression is pain

Heres my 7.62x39 bren failing with the Micro 30 on it. I have a suppressor setting drilled into the gas regulator (.0625) but I think a smaller size is needed. I feel dumb because I have two of these guns and the 5.56 gun has a much smaller ports on the regulator than even my added suppressed setting on the x39 gun. I plan to test the gun with that regulator to see if I can get a better idea of where I need to be. The gun was chucking cases basically 12:30, to the point where they were hitting my hand.

We took the can off and the gun ran perfect the rest of the day but had 3 failures with it on. It's pretty frustrating honestly that I didnt think to test the other regulator before i started having holes put in shit but what's done is done. I have a bunch of brown bear ammo coming in that worked great for me originally, so I'll retest with that and some other brands.

My 5.56 gun with its stock regulator has zero issues unsuppressed or suppressed

Edit: actually the gas regulator and pistons are different, didnt even notice till now. And the regulator on the 5 56 gun is vented but not the x39 gun. Very interesting

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My 9" Bren 2 in 7.62x39 runs perfect on the factory regulator with my Omega 30. I'd still like to have a 3rd position drilled though just to see if it can be mellowed out even more. I have a Micro 30 pending too, but it'll be a long time before I can test it.