Barrel Index, Need Help

[Doco overboard]

When I seated the barrel, I used a close fitting steel drill rod through the sight ears and a 36" Aluminum yardstick on the front sight base. Then I checked against a machinist bubble level on the same and it was as close as it could be. With the FS tightened at the edge of the gas cylinder base, the rear sight is 4 clicks right. I even went back and checked again after a few range sessions removing the FS leveling the work and using the level on the flat behind the rear sight. The combo shoots inside of that at 200yd and the settings are repeatable when the rear sight is adjusted. I would at the very least like to be able to get the front site post over about 2 min while staying inside the first set of graduations at the rear sight. I thought the barrel could stand a tighten to tidy things up a bit if that was the right way to go with it. I have the tools to do the adjustment but perplexed when I go over the procedure in my mind before I start. Thanks for the direction and everyone's input, I want to learn how to get it right myself and keeping fixing it till its broke..... then Ill see Chuck after its really out of of wack! In the interim I'm going to check out the literature that has been suggested and wait for replies before I get any tools out. Thanks again, Brian.