The specwar mount brought the suppressor out a little more on my set up, so it may still work for you.Rainier 10.5" select 300 blackout barrel with 110 grain VOR-TX. I don't know about the 1:8.5 twist for subsonic but should work great for supers. Got to change my rail out, a Midwest Industries 10.5" Key Mod rail and a 10.5" barrel doesn't work with a suppressor.
I'm just waiting for the efile to stay up long enough for Quiet Riot to get my paperwork in for my Specwar 7.62.
Also give the 180gr Gemtech subs a try, they are shorter than the 200gr+ subs