Hmmmm....I may take a slightly different angle on this shot....
I tend to think that the focus is your initial imagination of the "entire" shot, and then after you set up "perfectly" your mind can now shut off and "enjoy" watching the results of a cleanly pocketed ball with perfect shape...(that you have visualized)
Think about it this way...Once your set up you can close you eyes and still pocket a ball...what were you looking at or thinking during that shot??....The only thing I am thinking about is the visualization of the shot that I had already come up with prior to getting down on the shot...
I have run a full 9-ball rack by closing my eyes just before I shoot...What was I focused on during those shots????
Your eyes can actually be a distraction. If your eyes shitft during the actual stroke, it can cause your brain to short circuit, which I believe is what causes the "yips" or in pool...the jump up or slide......
I think that perhaps the harder you try and "focus" the easier it is for that very brief loss of focus at the actual stroke and thus the yips.
I find that when I am in "dead punch" ...(which can happen for a brief moment) I am only focused on the set up, and then It's as if I just closed my eyes and enjoyed the outcome of the shot...but I am unable to remember what I was looking at...or for that matter can rarely remember each shot in the run out...
It's when some "doubt" finds its way into the process that causes me to be aware of the "focus" on the OB that leads to the destruction of a run out.....More often for me...I am able to focus on making the shot...but I did not take the time to "visualize the entire shot" all the way through the CB's final stopping point and thus, I pocket the ball, but am now no where near where I need to be for the next shot...
In short...."focus" on the preshot and set up...then enjoy the outcome...
Actually ....just typing this out made me think of something...I need to simply change my shot visualization process....Instead of looking at pocketing the ball first and shape second, perhaps shape on the next shot should be looked at first, pocketing the ball second....