There is a thread on another board along similar lines. A couple of things come to mind from that conversation.
When shooting, dry firing, etc., make sure that:
1. You have the 'ideal' sight picture: focus on front sight so you have a crisp front sight, almost as crisp rear sight and fuzzy target. This may require mid distance glasses.
2. The front sight is your friend--keep your eye on it and not the target, make the target a 'background' to your front sight. Keep your eye on the front sight as and AFTER you fire, making sure it never wavers. You will find a tendency to look past to the target. As in golf, you want to 'keep your eye on the ball'.
3. Watch the top edge of the front sight. After some practice you will begin to automatically align the tops of the rear sight with the front, so you don't need to get distracted by the mechanics.
I have fired tons of ammo trying to improve, usually wasting it as I needed to learn these 'tricks' for real incremental improvement. You might say I practiced doing things incorrectly. Ouch! I am now reaching a point where accuracy and consistency are almost at a satisfactory level and speed is the next thing to tackle.
Oh, yeah. And also how to translate my offhand accuracy to other positions. Prone, sitting, kneeling and shooting from vertical rest (barricade) are still unsatisfactory. I know there are more 'tricks' to learn.