@Falt I agree with you 100%.....my cornerstone issue is trigger control. That is what I feel is paramount in shooting a pistol, concentrating on trigger press. @Ranger4 is invariably right also. The rear sights probably do need miniscule drift to the right. I do worry about aiming a bit too much and lose my focus on trigger manipulation. I'm only 6-700 rounds in, 3 months into shooting after a 25 year sabbatical, thus I'm trying to relearn a perishable skill. And perhaps the Blazer Aluminum is not the most accurate load in the world.......regardless, its what I can afford, a box a week. I'm going back out today and work on trigger press. Aligning the sights is far less difficult than pulling the trigger properly.IMHO the groups I see can not be fixed by aiming more carefully, they can only be improved by concentrating on the trigger squeeze and sight alignment.
Trust the basics, do not try to time the trigger press when everything is aligned. Try to keep the sights aligned and squeeze the trigger. The target has a very low priority.
I think that there is less variation on handgun instruction for precision shooting over here.
We teach aligning the front sight in the rear sight and to squeeze the trigger very slowly. The alignment with the target is secondary! The error you get with a slightly bad trigger squeeze is twice as big as bad sight alignment which in turn is twice as bad as not being aligned with the target.
Shoot five shot strings and rest at least 20 seconds between the shots. Wait a few minutes between the strings.
The same basics can be used down to about a second between shots after mastering it at slow speed with that weapon. Below 1s I squeeze the trigger at the right pace and try to align the sights and target as good as i can in the given time. Below 0.5s other techniques are needed, I have noticed that I can't practice those without performing worse at the medium speed shooting.