I had ENABLE_GYRO=1 in my assettocorsa\system\cfg\assetto_corsa.ini for a while, but I changed it back to:
[FF_EXPERIMENTAL]
ENABLE_GYRO=0
DAMPER_MIN_LEVEL=0.0
and the steering felt better again. I'd lost that lovely "holding the drift" type feeling that I used to have. ENABLE_GYRO=1 adds extra damping to the wheel, for direct drive wheels. I found it was making the steering a bit to sludgy and weighty, and prefer it off.