David,
That seems to be the elusive part doesn't it ?
Hitting the ball well, putting and chipping decently, but at the end of the day, your scores are higher.
Rick,
"Concentration" is probably more difficult to maintain on a constant basis, but, I think it's possible to focus in on the shot and circumstances at hand for the requisite amount of time.
It may be that your concentration is the same, but, the things circling around in your head have multiplied and ratcheted up a notch or two making it more difficult to isolate on the shot and circumstances at hand.
Whatever it is, and we all have different war camps to contend with, scoring seems to be more elusive.