Had to change a lot for the Hockenheim Historic with the Lotus. These are my actual settings for my T500.
Thrustmastersettings:
50% Overall strength
55% Constant
0% Periodic
0% Spring
30% Damper
Ingame:
I usually have it on:
Raw
100
95
50
50
0,4
At the moment its on
Custom
100
60
55
45
0,4
with this custom FFB:
https://drive.google.com/file/d/
1N4H_uuNEQOTIn43fJM-8MwmdlSQTuMOS/view
This goes into your ->Documents\Project Cars 2\ffb_custom_settings.txt
Not totally satisfied at the moment, but I can work with it.