Most of the very good players start their weight shift to the left even before they finish their backswing. That may be a key swing thought...start a lateral shift to the left before you reach the top of your backswing. Hope that is helpful to you.
Seeker

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Many thanks, I will try all of your suggestions. I have been trying to work on a lateral shift towards the target just before the downswing - what is the point of the lateral shift?
I see it mentioned in a lot of books. I have been taking lessons and the instructor is not keen on a lateral shift - he thinks it will throw off your angles. I realize there is more than one way to play the game, and I am always looking for new ideas.
James