Following information was posted by Wraithstrike on the Project Cars forum. For those still experiencing controller problems on XBox One after the patch, I can testify the following settings, with modification, have proven to me the patch works. I have tested it on Sakitto in the Lotus 98T, arguably one of the toughests tests of the controller patch.
Wraithstrike wrote this:-
"Guys I've been trying multiple cars from road up to LMP1 on a mixture of tracks to come up with the best settings, all cars tried I left at default tuning.
"Ok guy's if you want to set up your XB1 controller to really now enjoy the game here's your settings.
"Flick to mode 2 then back to mode 3 just to reset default, now set feedback to 80 and steering deadzone to 10, that's it job done.
"Mode 3
"Feedback 80
"Steering deadzone 10.
"Hope the above saves a lot of you messing around with you settings continuously"
End Quote. Personally, I have changed the steering sensitivity in the controller settings from the default suggested above to 0.
I have found that with steering sensitivity at 0 and the rest as Wraithstrike suggests, this allows you to then use the car setup as you see fit with each car and each circuit. With the Lotus 98T (an extreme case if there ever was one), steering speed needs to be dialled to the slow side (experiencing a bit of understeer with the Lotus felt like a luxury to be honest compared to the pre patch situation).
I also feel the setting can give some confidence that you can focus on the car setup without looking over your shoulder wondering if problems you have are related to the controller settings. 0 steering sensitivity might not suit everyone, but my advice is don't settle on this aspect until you have tried the extremes in car models, from carts to open wheel and prototype, testing the latter on the fastest circuits, with fast flat out turns, series of turns, s's etc. Theoretically, solutions should be with the car setup, not the controller settings.