Nice analysis Peter.

It would be even more interesting to see the sailors height and weight in this chart, but of course, the statistics are not easily available. I suspect there is a rough correlation between sailor size and the equipment they used. I know this is true in many cases, but it would be interesting to see the outliers.
There are many tradeoffs when choosing sail and especially board size.
Do you gear up for maximum efficiency for the big squalls and risk being stuck and slow between them. Or rig for more all around ability and possibly give up a little in ideal speed conditions.
And then there is top speed v's 5 x 10 sec. Going with a slightly larger board may slightly knock the ultimate peak speed potential, but can help you to maintain a great speed for more distance and in less than peak conditions. I see evidence in the results that some who went for larger board (and sail) may have done better in this category. And where the water is very flat (as it was yesterday), bigger boards remain much more controllable with less drag penalty.
And then there is what you are most tuned into sailing - ie. you have the opportunity to sail more specialist speed gear often enough to get completely comfortable with it. You will often go faster on gear that may not be theoretically the most efficient, but that you are extremely familiar with and comfortable and confident on. If this is your experience, it's often be faster for you to stick to the gear you are most comfortable on.
And then there is the other categories. Rigging for small pure speed gear reduces your efficiency for Alphas, Distance and I hr. Greg, the second sailor on that list in the list, not only
smashed his 2 sec PB, but also his
alpha and NM PB's as well.

Hard to do that on pure speed gear, but earns great respect for his speed on his slalom board.

Although Byron proved it can be done,
with a super all around effort and numbers on his
44cm speed board, including a 28 kt hour!