I have a 12VSS in .308/7.62 with that Choate stock but I haven't experimented with the torque settings. I have a 16FCSS in .223/5.56 where I have. Try going up in five or ten inch-pound increments, fire five, repeat. I saw my groups go from just over an inch at 30 lb/in to at or under 0.5 inches at about 40 lb/in. You may want to borrow or buy a torque wrench with a higher maximum.

My old post on the process