As many of you are aware of, I run the #343 2000 Insight in mostly GBGT presently at Loring and previously at ECTA NC. I also had concerns for the relatively short WB until I researched and found most Porsches, and other more exotic sports, including the Ferrari F40 are all under 100" WB and many are capable of exceeding 200 mph. They also turn and go up hills and down, and more comfortably than a sanctioned LSR vehicle. I say sanctioned as our cars are built for speed, in a straight line, Period.
We had minor stability issues at first , which had to do with spring rates, not anything endemic to the car.
Same deal with Aero, we also wondered if what applies at 55 mph is the same over 200. I can't give a definitive answer as we've not exceeded 177 (officially), but widely available Aero formulas give anybody wants to run in a class where this car fits the incentive, as it can go a lot faster with less HP than any other ICE production car ever built.
Another point to consider is the negative aspects of a long WB, as in a short WB might spin more readily but it won't roll as fast. Just sayin'......MVHOFWIW....
I hope this discussion stays constructive....
Bob Wanner