Caffeine is the mortal enemy of the competitive shooter. My coaches were rightfully fanatical about our abstinence back when I was a serious shooter. I have since grown to love coffee, and it's a terrible dilemma.
If you can dry out from the buzzjuice, I guarantee you will see significant improvement.
"A human being is primarily a bag for putting food into; the other functions and faculties may be more godlike, but in point of time they come afterwards."