When you have multiple controllers, the easy way is to pick your steering wheel from the list and then just redefine the switches as needed. That's what I do in all games for my CSWv2 with G25 pedals & shifter.
But if you're doing it the harder way... in your player folder, look at controller.JSON. The following line is possibly the answer:
"Steering effects strength":10000,
"Steering effects strength#":"-10000 to +10000, applies to all steering effects (torque, resistance, static spring, jolt, etc.)",