Re: Techniques, and help with them
I'm by no means a great shot, but I do love shooting, so take this into consideration. It sounds to me like your rifle set up is better than average and shooting to what would be expected. You said your gunsmith gets sub moa. I suffered for a few years with what I am expecting is your problem as well, the dreaded flinch. The good news is you can over come this more than admitted ailment.
I will tell you how I over came my flinch and leave the shooting technique to the more skilled and experienced shooters on this site. First step was dry fire trigger practice. This helps develop the proper trigger pull (straight back, controlled squeeze), at the same time not having the recoil, or report of the rifle. I still jump at just the bang of a rifle going off at the range. It is important to squeeze the trigger so slow you won't know when the release will come. This will keep you from anticipating the moment of fire. Hopefully by the time you flinch, the bullet is already out of the barrel. Now do not be in a hurry to get through this stage you have to reprogram your brain and that will take a while. I am not saying don't actually go shooting but put in some dry fire every day.
Second step is to practice follow through. After the shot, how do you react. The best way that I can explain this stage is FREEZE after the shot. Don't lift your head, don't move the rifle back to target, don't move your body, do nothing, even if your eye is no longer looking through the scope, don't move. For now just take the shot and count to 3 till you actually move. This will help from actually moving before or during the shot. You will be more relaxed with the shot.
Now beg, borrow, or buy a 22. cal and get out there and practice practice practice. A 22 allows you to shoot a lot for cheap, and nothing helps more than trigger time. Some of the top shooters still hit the 22 more than their competition rig. You can really challenge yourself at the range with a 22. Hope this helps a little, but in the end you have to find what works for you, so don't be afraid to experiment to see what works. By the way do you reload yourself? This is another great way of getting more accuracy from your shooting.