Yes I hear you, the esses are interesting. I usually run out of gearing on that track when I'm in the BMW, next time I go will be the third time I've been there so I'll be trying out a different diff.
In that video we were datalogging boost pressure, because I'm trying to setup different boost levels for each gear so it increases, rather than be at a constant level so that way the lower gears aren't all wheelspin. I filmed it because we are rebuilding the motor this summer for about 500whp and just wanted to see the difference.