Try my recommended settings for the Moza R12 to use with Assetto Corsa Competizione, or ACC as it's known.
Moza Pit House Settings
Basic Settings
Steering Angle - 900
Road Sensitivity - 10
Game Force Feedback Intensity - 100%
Maximum Wheel Speed - 100%
Wheel Spring Strength - 25%
Wheel Damper - 5%
Advanced Settings
Maximum Output Torque Limit - 100%
Hands Off Protection- Off
Natural Intertia - 250%
Wheel Friction - 15%
Speed Dependent Damping - 15%
Start Point of Speed Dependent Damping - 90kmh
FFB Effect Equaliser
10hz set to 200%
15hz set to 200%
All other EQ points set to 100%
Base FFB Curve
Base FFB Curve - Linear
Miscellaneous
All Settings Default (Make No Changes)
In ACC's Options > Control
Gain - 50%
Minimum Force - 0%
Damper - 0%
Dynamic Damping - 0%
Road Effects - 0%
Frequency - 400hz
That's it, you're ready to drive.
If you need to increase or decrease the general strength, do this by adjusting the Gain setting within ACC's in-game Controls menu (currently set to 50% if you've followed the settings above).