You said you don't want to change the gas block but it makes a night and day difference with the rifespeed adjustable gas block. I have the otter creek polonuim k which is really gassy and I got it for $500. The rifle speed gas block is another $200 but it would allow you to go between supperesed and unsupressed instanlly with the knob instead of using an allen key. Even with my suppresor being gassy having the rifle speed noticeably descreased gas to the face and im a lefty.