You may be looking at this all wrong....Forget the pun.....To solve your problem as first discribed you need to get rid of the post front sight.....You need a round aperature front sight....The best would be to have several different size front aperature holes for various size targets or distances......And the same would be nice for the rear, but you can to some extent ,as you know, make the rear larger or smaller by moving your eye closer or further from the aperature hole.....The key here is very simple you need a rear aperature hole, which you have, actually a choise of two sizes.....Next buy a round hole aperature front sight to replace the post sight..... get several sizes and they are available and screw right in.....Think the sight set up system as centering a hole on a hole with the target in the middle....your eye will easily do the centering work automatically...Your only job is to pick the right size hole for best clarity and pulling the trigger.....Stop trying to deal with a post front sight...,.your eye can not and will not self center on a post front sight without fighting with itself to try and focus back and forth on three things at the same time......This is exactly what you discribed in your original posts.....This will help a great deal with shooting irons........best regards plum