What I have a difficult time comprehending is how Brian can take a simple concept such as pivot-centered tripod and completely misinterpret it by drawing lines at the top and at impact for the spine. I think all but the newest members here understand the term pivot-centered tripod and understand that it is not about spine or axis tilt. A lateral shifting of the hips in the downswing DOES NOT mean someone is incapable of adhering to the pivot-centered tripod concept.
Matt
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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)