I setup the spade files, which by the way are easy to uninstall and don't interfere with the existing FFB settings they just over-ride them.
I tried two of the cars I have already done some laps on around Donington National, which I am very familiar with.
Focus RS. When I tried this the other day the FFB was horrible, default and it was difficult to drive. With the Spade files it was really, really, horrible, practically un-driveable.
Formula Rookie: I felt there was less feedback for me again although it did provide more control.
So I deactivated the Spade files just by renaming the folder they come in.
Instead I basically one at a time modified the Car Setup FFB parameters one by one and tested each time afterwards to get an idea of how each parameter changed the feel.
By doing that I think I now have an idea of how to change things to my preference. I certainly managed to get the Focus and F-rookie to my liking.
[edit] This post about FFB has been the most useful for me - especially the Spindle parameters
http://forum.projectcarsgame.com/showthread.php?23124-FFB-Tuning-(my-thoughts-)
Yet another 1/2 hour session turned into 4 hours
Thanks for this, it is completely brilliant. Had it running on my 2nd screen. Crashed a number of times while glancing at tyre wear etc...
Afterwards I spent ages analysing my laps, and have found it very informative. I'm going to have to give the guy a well deserved donation!