I think I kept to True Drive settings to whatever the default RRE profile is on my SC2 Sport. I did have a minor fiddle in game though, and will try to remember to post what I have later after work. For the most part though I found the default profile in TD, and the default SC2 controller profile in game felt pretty good to me. I also reset the FFB settings on each car, and then tweak for desired feel from there though. Most cars only 'needed' a +/- ~0.1, but there were a couple that I pushed a bit more either way.
You could give these settings a try. They are the best I've found so far, with credit to @Andrew_WOT1 https://community.granitedevices.com/t/recommended-settings-on-raceroom-2020/4475/102?u=esxpaul https://community.granitedevices.com/t/recommended-settings-on-raceroom-2020/4475/103?u=esxpaul