I will try and post a pic later of my xx4 with the CR rear - I am on my Iphone right now.
I could always had - too much front end with the one way in the xxx4, but when I ran the car, I didn't get as much practice time as I would have liked, so I didn't get to experiment a whole lot. I just tried to run the team set ups. Looking back I would start there and try to add more traction to rear.