The following is taken from Maximum Golf by John Schlee
A score is. It is posted, then it dies, no matter the number. Here are the rules of the score:
(1) Always have a procedure to a specific target.
(2) Play each shot, one shot at a time, to the best of your ability at that moment;
(3) When the shot does not please you, forgive and forget, then play the next shot to the best of your ability, at that moment;
(4) Continue this procedure until all 18 holes are played;
(5) Post the score;
(6) After the round, applaud your best efforts; then analyze your mistakes; correct them in your mind; and the round is finished;
(7) Compare yourself to no one else--only the golfer you know you can be.
(8 Repeat the procedure and post a new score, letting yourself get closer to the edge of your ability.
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"In my experience, if you stay with the essentials you WILL build a repeatable swing undoubtedly. If you can master the Imperatives you have a champion" (Vikram).
The reason you can't sustain the lag is because you are so eager to make the club move fast (a reaction to the intent of "hitting it far"). So on a full shot you throw it away too early, which doesn't happen for your short chip. (bts)