Driver traits probably assist the driver rather than assit them. Also I'm unconvinced there's any reason to ever take one of the slower frames given that this is a race, and it's just a huge advantage. 2" is almost adding an entire die every time they roll. This is also why the last place gate advantage isn't big enough. Also have to agree with Baarfa re: theme fitting.
Oh and why specify vehicle scale as 32mm instead of like "hotwheels'