For your stated goal of 2-300 yard 1 MOA accuracy I think you are way overthinking this. I agree that a 25$ RCBS FL sizing die setup to bump the shoulder back 2-3 thousandths should be more than adequate for what you are looking for. I personally don't think that the brass brand matters that much as long as you keep it grouped together as per times fired. I will say that annealing after a few firings will help with the neck tension returning to the original value. Don't complicate things by adding additional variables. If you can't get the accuracy you are looking for with basic loading tools and processes try a different powder (or charge weight, or bullet, or seating depth).
Good luck
