I have often heard it said that a player should try to work the ball away from the hazard. If there was a lake down the left I should aim a little to the right of it and hit a fade. I question whether this is the best play. It seems to me that I would lower my percentages of hitting it in the lake if I aimed just right of the fairway and hit a draw. Even if I hit a pull draw (snap hook is a different story) I'm still not in the lake. A push and I'm still safe. If I try to hit the fade if I pull it and don't get much fade I'm in the lake, and if I am trying to put left to right spin on it my swing path is probably toward the lake.
I guess if this post establishes nothing else it is that the conventional wisdom in regard to working the ball away from hazards may not work best for you.
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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)