That's a question for @
CSG Mike or one of the other race drivers, but I'll contribute. You don't want the car tuned to oversteer, but it'll oversteer anyways if you give it too much power in a corner. Think spinning doughnuts vs. carving circles. It's easy enough to crank the wheel over, floor the throttle and whip the rear end around into a spin. It's less easy to crank the wheel over, give it enough throttle to break the rear wheels loose, then counter steer and turn your spin into a sustained and controlled drift that goes where you want it to go. It's much less easy to turn in on the correct line, ease in just enough throttle that the rear end barely starts to come around, don't counter steer at all, and then hold your car on that line by using throttle inputs to rotate the car through the corner. That's what throttle steering is.