Yea slam that thing (not all the but like 80-85%), get a 1 way LSD and crank up the rear spring rate, increase the rear sway bar all the way, leave the front sway bar a little better than the middle, same with the springs. Crank in a ton of rear camber and a conservative amount of front like 1.2-1.8 deg or so and you will be able to steer that thing with your right foot (er thumb) all day long.
If you learn how to tune suspension on a real car, there isn't one KID that can beat you at GT. Kids don't know how to set up cars. I whup every little kid that thinks they rock at GT. A couple of races and the kids are asking me "Hey what did you do to your car to make that corner?" Its been a few years since I played, but I was so impressed that the programmers took the time to make the game and the vehicle dynamics very much like the real world. I love that game.