Do you know your eye pattern? And do you do the same routine every time? I know that for myself sometimes when I miss I see nothing but black so to speak. I think sometimes I also go back and forth between the cue ball and object ball too much and my eyes have trouble focusing because of this. I think that less eye movement and pausing either at the front or end the stroke will definitely help. I just read a book call See to Play The Eyes of Elite Athletes and it was very informative with a lot of ways to help work out your eyes and how they work in relation to sports in general.