Hey Brent, I've got a theory on the front end chatter you pointed out on the F4i under hard trail braking.
I was at the intro as well (it was my first, representing CityBike magazine), the only time I would get the bike really bent out of shape would be when I would upset the chassis while hard on the brakes, usually when I was trying to match revs. I dove by Burns at one point coming off the back straight into the hairpin, he had a front row seat as my bike chattered around under heavy braking, after that session he asked me if it was the front end chatter you mentioned.
The stock front end felt pretty soft on the bike compared to what I'm used to, I don't remember the settings but I think they had to be preloaded a decent amount to get sag numbers in the ballpark. I've found on my racebike that excessively preloading the springs gets them out of an optimum working range, loading them makes them a bit susceptible to chatter. Heavier springs and larger sag numbers have alleviated the problem in the past.
In any case, that was how I interpreted the feedback. Basically, it felt as though my fat ass overwhelmed the stock front end on the brakes, and any lack of smoothness (i.e. my downshifting) would get the bike bent up in knots. The revs would rise and fall on the bike much more quickly than on bikes I'm used to, matching revs was a little tricky for me at first. Later in the day, I started getting the hang of it, I could go much deeper on the brakes into corners, without any antics from either end of the suspension.
I'm pretty doubtful the chatter was from fork flex. Haney, Toland, and Freddie were going a heck of a lot quicker than most of us were, while still looking pretty darn smooth. Respringing the front end and reworking the valving would likely eliminate the problem, especially for the heavier and faster riders of the group.