So then.
Spent this morning making sure everything was setup. Ive reinstalled my drivers, updated all firmware and tried Dirt Rally 2 again.
As i thought, it made absolutely no difference to the FFB in this game. Codemasters are aware of the issues
https://twitter.com/dirtgame/status/1098952611083010048
What you have posted DG is basically the same guide that i have made on steam. The force feedback in this game is very basic, and quite possibly broken.
1, Tyre friction & wheel friction in general don't seem to make any difference whether you set it to "0" or "150"
2, The FFB in this seems completely derived from what the suspension is doing. Generally small bumps that cause the suspension to compress you will feel through the wheel. In some cases where i drove on an angle at the edge of the track the feeling seemed somewhat realistic but not precise.
It does not give a good representation of the undulations on the track, it only seems to produce the bumpy FFB but not any idea of camber in the corners. I do not think that the FFB in DR2 is able to translate tire slip or any sort of feeling of understeer or oversteer (at the moment). This can be offset by playing with self aligning torque but its feels a bit fake to be honest. I feel the Force Feedback in this at best is very very basic.