Pete,

You are not going to get any real numbers worth you could sort.

1 guy is pinching a bit, going slow and sideways. Boat 2 generated a bit of hull speed and rode his foil lift up to the same angle of attack but is maintaining speed and going twice as fast.
Maintaining hull speed on a downwind point of sail is even a larger performance gap generator.
Technique generates speeds and watching tracks from the very top F18 guys at NA and worlds, huge spurts of speed came with pressure and once you drop out angle of attack and VMG are all over the place even with the very best of the drivers.

I am sure the AC programs are working on this with huge budgets on instrumentation and computer modeling. At least to date this is obviously not working there. Boat handling and reading the conditions is way the more important factor. Coutts has been made to look like an amateur at times. I would bet he is relying on his past experience and trying to be scientific rather than reacting. If you have to tell somebody to do something or wait for a number to tell you to go, it is too late on cats. Anticipation is key to ultimate speed.