I now drive with these settings.
They are MUCH smoother and depending on what car of course, but really driveable.
100
10
10
0
30
250
This XBone setup is really good. Really really good in fact. As close to a wheel as it possibly could get, maybe. I now drive with this. It got me an online podium finish (second online race I've done because of crappy settings)
Controller settings with update 1.03 AC PS4
Vibration: 85
Speed sensitivity :25
Steering speed: 100
Deadzone:1
Filter:0
Gamma 2.8
In video setting i got visual steering wheel at 400 degrees.
@Donnced - Settings feel excellent. The steering speed of 100 must be what makes the drivers hands look very twitchy from the in-cockpit view, but if lowering it changes the overall feel of the car then I'll leave it and use a different camera angle while driving. Thanks for looking into this after the 1.03 update =)