I use to use Toe in, like I use to have on my subaru rally racing.
I had my first race and run on a rc track last weekend with a slash 2x4 and a SC8 nitro. The car was in fact tracking well. but really under steering or turning at low speed.
after chatting with few other racers, they told me to toe out. I tried that and in fact the car was turning really fast and sharply.
what came out of that is:
Fast long turn, toe in for stability and slow turn.
Curvy and sharp curves, Toe out for a faster turns and more aggressive bite in curve.