Forcefeedback issues on my Formula Rapide

On the Formula Rapide and other private projects of mine, theres always issues with the ffb. Meanwhile i know of the ffb multiplier in the car.ini, i can´t find out how to change the ffb settings like slip,road,kerb and abs.

While i can of course change and save them in the ingame app, it doesn´t seem to save them to the car itself. Allot of people complained now about my ffb being way too strong an shakey, and the ffb multiplier doesn´t fix that. Im out of ideas really. Would be cool if someone could help me out there ;)