I will try more things the coming week. The car is already very good. I am just looking for the last 1-2 tenth that make it a race winner. Your ideas are always welcome! I thought of thicker oil in the rear gear diff, but I am not sure if this will give oversteer on the corner exit...
When I started touring car with the TC5, I learned setup the hard way. The teamdriver setups made the car understeer very strong and the Xray setupguide implemented the opposite of the written behaviour. So I learned by doing and suiting the car to my driving style.
Edit: Just another picture to make clear how the "increase toe bumpsteer" looks like:
This setup gives around 2* additional toe in when full deflected.