There is always more than one way to skin a cat.

If you start out with a round rear pillar, you can also grind off with your dremel the absolute minimum required to ensure clearance with the sear.

Barrel Tuners? I have never used them. My understanding is that they do work, both the Browning BOSS type as well as the Limbsaver-type donut. They change the barrel vibration to match the load, as foxx said ("That's what the foxx says!" ) instead of tuning a load to match the barrel.

Since you will be using factory ammo, yes, I would try a barrel tuner. It certainly can't hurt.