That's why you are running them!
IMO, if you know why you missed, the reason you missed is because you where thinking.
Actually when you are concentrating to the highest degree, you are not seeing, feeling , hearing, tasting, thinking, etc., anything. What do you see when you get into a deep tired stare? Do any of your senses register in your brain when you are in a deep stare? That is the concentration required to hit the bird every time. This is why in my opinion, very acute vision is required to achieve this level of concentration. It seems to me that you have to see very clearly, to get to that point of concentration, where everything else is not registering.
That is what separates the Leo's, Phil's, etc., from the real amateurs. It is what separates all pro athletes, from the amateurs with the same physical abilities, IMO. The ability to concentrate to that point, for the required amount of time, every single shot.
Unfortunately, it is the hardest thing to achieve in shooting, but in my opinion, the most important.