Get the device(forgot the name of it) that lets you manually adjust the amount of torque distributed to the front and rear wheels of a 4wd vehicle. Set it so the slider is all the way to the left. That way it will handle a lot more like a rear wheel drive car, so there will be less understeer, but more oversteer. You can adjust the device to your likings of course, i was just saying that is the setting that produces the least amount of understeer.