Impressive Joe. :eek
re top end traction: In the GT Tech forum, Neil Hodgson is quoted about his plans for a race car and the author of this report writes, "One thing the GT won't get is the high wing seen on many road racers, a testament to its aerodynamic prowess. Hodgson plans to replace the fixed gurney flap with an adjustable unit, but the rear end already pulls 1 g of drag. "If you pull it up another quarter-inch, it doubles the downforce," he says. "It's very efficient just the way it is."
So maybe a taller gurney flap will help you when you are on the road. Have you considered this?