This post will contain two things: first are the settings ( TWO VERSIONS ) you are looking for and my thoughts on each ( or most ) of the individual values. Before you go straight to settings and skip reading the rest, consider a few important items:
It appears that not ALL 2.5 wheel bases are the same. Depending on production date/firmware/software there seem to be differences in the way settings affect wheel behavior.
Wheel base setup is just 1/3 of the overall and final steering behavior in Assetto Corsa. Other factors are advanced in-game settings and the specific car physics/geometry that the "manufacturer" ( Kunos or modders ) creates. It's a good idea to understand how each relates to one another, your experience tuning and getting the feel you want will be that much better.
Option 1, these settings are ran by several of our members and they like it, pictures below:
Next are what appears to be NEW(er) 2.5 base settings that few other people and I run:
First, check out the following for some really good info on FFB settings explanation:
This dude brakes down what each parameter does better than I could, so read up on it and be familiar.
I will be adding drift specific suggestions later in the day when I get a little bit more time.