I think slight uphill would be better for a person's swing in general. Downhill really forces you to stay down on the ball a long time and isn't a great habit to have.
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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)
Hitting down and taking a divot on an uphill lie is easy, so I would say practise on the downhill lies and reinforce the principle of hittting down to low point.
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