Cool, I have the gopro Hero HD. Have you tried changing the exposure settings to SPt (Spot meter)? It works much better than the default setting when you're inside a car looking outside where it's much brighter.
I've gone flat out on turn 1 but I don't do that anymore ever since I went off. The pucker factor is too high and I end up too far to the right at track out. FYI my car is pretty heavily modded - intake/header/exhaust/tune and suspension. I'm working on the driver mod now
What brake pads are you going to try next?