On a steering wheel and normal setup (for exemple 540 degree rotation on the wheel) there is a physical limitation on how fast you can turn the wheel. It looks very hard to me to do more than 1080 deg/s. A limit at let's say 300rpm (or less that is 1800 deg/s) would be great for realism. I mean if you play on a game pad you can have such rates that are crazy fast and a real advantage for fast counter steer. Setting the wheel to 30 degrees lock to lock would be around as fast and it is not realistic either.
Limit the AI would also be good.
Limit the AI would also be good.