I focus on the position of my spine and chest in relation to the ball rather than where the ball lies in between my feet.
I'm right handed.
For wedge and short irons feet closer together, slightly less than shoulder width, spine tilted back due to right hand lower, ball should
feel it is line up with my left eye/left ear.
Irons - feet shoulder width apart and ball should feel like it is lined up with my left shirt pocket or logo.
Driver- feet wider than shoulder width but ball should feel it is lined up with my left arm pit. With driver I tee ball slightly lower and at impact swng should be at level or slight downward blow since I dont line it up with my left toe which is more of an upward swing at impact.