I'm not trying to do much more diagnosis or theorizing until the Kohler points arrive, but I was intrigued by the notion that the screw for the lead was too long. I was hoping that I had missed that, as stupid as I would feel, it would be gratifying to know that it was the cause. Alas, it was not. There is quite a bit of movement in the cam before it ever hits that screw. The picture above is deceptive, so i decided to take another look and add some documentation for future reference.
Thanks again for everyone's input.
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