I use a shaft one-way instead of a diff one-way. It's not as aggressive in the turns but still allows you more speed in the sweeper and straits.
If you race "Stock" you shouldn't really ever use your brakes. If you are using them, you need to develop you driving style a little more.
We race winters on a very small technical track that allows you to get 5.5 second lap times. I learned a lot about setting up turns etc on this track. It's so fast paced and narrow, you're required to learn to drive just to keep up.
Now that it's summer and we are outdoors, a lot of what I learned carried out into the wide open outdoor track. I'm constantly running in the top 1 - 2 positions and by not using the breaks and learning to throttle threw the turns I am able to gear 2 - 3 teeth higher then the others on my track and keep the speed up.
ChristopherKee