Excellent sights, sir.   

Have you ever tried using multiple colors in your sights?  I've made a few crude ones for myself (MS Paint  

) and have found that just as in modern pistol shooting, having a different color (often brighter) as a center aiming point is easier for the eye to pick up, especially for snapshots, etc.  
Of course, I'm the same guy that puts dots all over a golf ball.  If I don't focus on one of the dots, I somehow zone out and hit the big green ball before the little white one.   
