Okay, then we need to do it another way.
Delete all LUT files in your Documents/assetto corsa/cfg folder and also delete the ff_post_processing.ini
Then start content manager and check if no LUT is active anymore.
Set the ffb gain to 100% and the minimum force to 0%.
You should have a "dead" wheel around the center when driving straight.
If yes, please put the minimum force slider to 10%.
If your wheel is now shaking left and right whole driving down a straight, lower the minimum force to 5%.
If your wheel is still a bit dead in the center, set the minimum force to 15%.
Find the minimum force value where your wheel is not dead in the center anymore but is also not shaking too much left and right.
If you select the BMW Z4 GT3, your wheel should move left and right when going straight but you should be able to hold it from shaking itself up until your crash with one finger.
It will feel more it less okay but you will have some "clunk" or "notch" when driving through a chicane.
That's because the minumum force setting isn't smooth. It's a hard edge.
My LUTs all just replace the minumum force with a smooth curve. It's no magic, just a bit complex.
Tell me the minimum force value that feels the best for you.
I'll create your a LUT for it to make it smooth