I ran my 1/10 scale buggy with open diffs, I didn't like how it understeered. I thought of putting the one way into the rear of the car. It worked great. It creates on power oversteer so I can hit the throttle early and get through turns faster.

I say this because I want my 9.5 to have on power oversteer, nothing so it gets fishy while full throttle, and nothing that will put me into the outside wall while on power.

I'm thinking of running 30K in the center and 30K in the rear, maybe I'll stick with something loose like 5K or 7K in the front.

Anyone ever try something like this?

No, coz we run 8th scale, but what you plan to do is similar to runing a torsen in the rear. I'm guessing you want to go drifting more than racing.