Looks like a scarily-fast track layout all along the bottom there. I'm the same way with trusting the tires. When I hear them start to barely slip, I treat that like a limit, but when a better driver is in the car telling me I can push it harder, I find there's actually a lot more grip left out there to take advantage of. I guess it just takes more experience driving closer to the limit to really feel the edge of loosing traction just due to cornering speed.
Must have been a lot of fun
.