Width of rear sight slot makes a big difference in front sight clarity and placement.
With a rear sight slot of appropriate width the front sight will be clear and sharp when viewed thru the rear slot. You get some light on either side of the front sight, and you can easily put the front sight right between the two vertical walls of the rear sight slot.
If the rear sight slot is too narrow, the front will appear fuzzy or you might have the appearance of two front sights.
if the rear sight is slot too wide, you will have difficulty placing the front sight in the middle of the slot.
I make a fake rear sight out of black electrical tape, and keep nipping the slot wider until I get the picture I like. The slot width is also a function of distance from the eye, so keep that distance consistent when experimenting.
Try that, or try getting younger.
Tom