Certainly advocate the torque wrench to ensure the settings are known and repeatable. I would also suggest doing your own trials with torque settings, especially if you don't have the history of how your current advice was arrived at (though don't forget to undo the bolts using the standard wiggly allen key and not the torque wrench ).
You could also change the ammo (or batch) and see if the flyers persist, assuming your technique is OK. You have a barrel tuner so that is another area of experimentation, and likely prior to getting too deep into torque settings. And only change one thing at a time to know what it is that's had an effect.
Personally, I set my 20xx rifles to 5nm and have not experimented, purely because I've not found the need. The rifles shoot consistently in the middle with the wobbly thing at the rear the only variable. The less to fuss over, the better IMHO. It's possible 5nm could be improved upon, but I suspect not by anything I could detect. I torque the muzzle end pair first, then the butt end pair after uncracking the previous bolt settings half a turn using the wiggly tool, with the rifle held vertically on the butt end to keep contact on the recoil lug.