You claim to routinely accelerate to 150mph on a freeway on-ramp and yet you claim that your aren't wreckless?
a) Quit doing that stuff on public roads. This hobby does not need our own version of the Malibu Enzo wreck
http://www.wreckedexotics.com/special/enzo/
b) Please confine these sort of efforts to closed competition venues. This will at least ensure you are using the minimum safety equipment and properly rated tires.
c) Build up your efforts in small bites. You want to find out how the car behaves at 160 BEFORE you are going 170. Because if you break through some kind of wierd behavior, you still have to go back throught that speed range again. This is why SCTA and the open road organizations make their participants start in the lower speed ranges before they allow them to enter unlimited classes.
d) When asking people for advice regarding something like this it is in poor form to give them lip when they voice concern for your safety and those around you.