What type of rifle, a bench rest rig? 0.2" 5-shot groups, at 100-yds? Are you doing any long range shooting with this ammo (500 - 1000)?
Neck turning for every load, I'm not sure about that, sounds excessive.
Weighing and segregating / culling out cases may not be unusual for long range / high precision shooting.
Weighing high quality bullets, sounds excessive, how much variance is there? When I weighed good quality Sierra or Hornady bullets, I stopped after a few, not enough variance to matter.
I know from experience that concentricity, within reason, can be overemphasized. As long as you are under 4-5/1000 in runout, should be ok. Using high quality components, equipment, and sound process usually limits runout. (I use a Coax press and its great for alignment when seating with a good competition seater die.)
If you are getting 0.2" with both loads, and that's your targeted range for performance, looks like he has more diminishing returns than you. That's amazingly tight.