Anywho, after much wracking of brains here's the best that I came up with....

...Disgusted with my inability to model the much discussed knee in the curve I decided to just move on and come back to it at a later time. I finished up some bits and pieces of HGDT and even went to work on the webpage.
Working on the webpage I felt that I needed to compare HGDT to *something* so I revisited Latke. Yeah, the spud has already been talked about. Given how badly I was modelng the spud I was scared to see what would happen if I modeled anything else.
Long story short: I threw HGDT up against the Latke L2 shooting wood data.
WTF?......

....While I love that HGDT is riding the Latke data pretty well... Where did the knee go?
ARGGGGHHH!
Project for immediate future: Look at the rest of Latke's data. Is the knee endemic to the spud data, but not the wood data? If so, why? Blah blah blah.