At this stage part of it is probably your brain trying to adjust for range and windage. Add to the equation that your "zone of focus" is quite likely bigger as well, ( the tiny spot you concentrate on at 20yds is now a lot bigger) can cause you to begin shooting at the target as opposed to a small spot on it (been there, done that, still going there occaisionally

) Try using the nock of the first arrow you shoot as your target, regardless if it's in the middle or not.
RC