You run what you want it is your ride and you are the one who has to drive it!!!!! I know that I like more bite in the rear and I run the diff oils the way I like ,and make sure you change the oil and much as you can to keep the gears nice and clean and to change the weight's around you will feel the diffrence and see it in you car as soon as you put on the track . That's what I am into is making little adjustments and seeing how if affects the car. So you do what you want and then you can learn from you trying diffrent things