-15/-15
12.5/6.5
9/9
6/6
7/1
2.7/1.5
-0.20/0.05
LSD: 7/30/5
For the gearbox, set to default, then set top speed to minimum, then set final drive to minimum. Now set 1st as long as possible, 4th and 5th as short as possible, and set 3rd between 2nd and 4th.
Disclaimer: This is, aside from gearing, purely a guess as to what should work. Reducing front anti-roll bar will reduce understeer, reducing LSD accel will reduce snap-oversteer when the tires spin.