This is what I use:
It is important to note that
1) You have to set the controller input mode before you do the rest of the settings and
2) currently you are not able to set the throttle and brake deadzone or sensitivities independently.
For example, if you set the throttle settings to 0/25 and the brake settings to 15/30, they would BOTH change to either 0/25 or 15/30 as soon as you exit the settings screen. I have not found much information on this despite a great deal of searching, but this is what I have observed.
Steering Deadzone: 10
Steering Sensitivity: 0
Throttle Deadzone: 0
Throttle Sensitivity: 25
Brake Deadzone: 0
Brake Sensitivity: 25
Clutch Deadzone: 10
Clutch Sensitivity: 45
Speed Sensitivity: 55
Controller Filtering Sensitivity: 75
Force Feedback: 100
Controller Input Mode: 3 IMPORTANT THAT YOU SET THIS FIRST!!!!!!!!
Advanced On
Soft Steering Dampening On
Visual Wheel Filtering On
Opposite Lock Help Off
Let me know if you have any other questions!