Here is my story…
Problem #1 Like most folks in their “early” fifties I started to have difficulty seeing things as they were in the past as my eyes age. I found that my eye was not picking up the front sight on presentation but rather grabbing the rear sights immediately then forcing me to transition to the threat and then back to the front sight. This proved slow and it is not what we teach… i.e. “FRONT SIGHT FOCUS” and it is slow.