Well obviously i don't know about the other rwd cars of S2, but i have the same problem with the XRT, just can't keep the back end under control. I'm using a mouse for steering, and a joystick for throttle/break. Mainly driving the XFG (my pb with that is 1:33:92 btw), just ocassionally trying out the XRT, but got annoyed with it fast every time. First i used mouse for throttle/break too, and i thought it was because of the digital inputs that i couldn't keep the rwd cars from spinning. So i changed to joystick, but it didn't suddenly make me any better. So what i'm doing now, is driving the XRG, it's much easier since it doesn't have as much power as the XRT, but you still have to be cautious with the throttle during corners. I'll practice with it a little, then i'll see if i learned anything from it to help me drive the XRT properly.