Smooth throttle finger really helps keep center diff temps down. Ballooning the front tires constantly is a dead giveaway that you are on your way to a hot diff. I try to be careful with diff fluids. I run just thick enough that my front tires do not balloon drastically on power and i can make all of the key jumps. I find a line on the track that allows me to carry as much cornerspeed as possible so i dont need to run crazy thick oils in the center. Real thick in the center will even out front and rear drive bias but your car will want to always square up on power and hurt on power steering.Getting a good balance between 5k and 10k dependant on layout and level of traction will be ideal. This is what I have experienced at every track i have raced at. 5-7-3 has been my tried and true.