I think it is excellent setup (I assume you don't use "replace with a custom script option"), I think these two tweaks make this even better:
1. G-force influence fast response fading setting to 20% - this will stop the big boat feel for bumps and will make a feeling of a car better - it is more like a speed boat now.
2. Second tweak is to stop the head tilting so much that on steep hills the track vanishes behind the dashboard (you drive blind) - change slow response gain to 0.005, 0.15, 0.02