Right so you had negative damping on in your active controller so that is the issue. Let me know how you get on with this.
Close RF2
Put these two files in \rFactor 2\UserData\Controller and overwrite
Open RF2
Go to options > contols
Load > Ajfan preset
That should do it. There's a setting called "Use thread":True, in this Json, and I'm not completely sure but I think this might be best off from memory. So there is another preset which may work best - try both.
Close RF2
Put these two files in \rFactor 2\UserData\Controller and overwrite
Open RF2
Go to options > contols
Load > Ajfan preset
That should do it. There's a setting called "Use thread":True, in this Json, and I'm not completely sure but I think this might be best off from memory. So there is another preset which may work best - try both.