Are you using an Adj gas block?

[Drillboss]

I love all of y'all, but are you possibly talking past each other? I don't have first hand experience with suppressors, but from what I've read, adjustable gas is the way to go with them. I've put together 4 Grendel uppers without adjustable gas (and without suppressors) and they've all ran fine. A properly sized gas port seems to do the trick without suppression.