Do you have your DS3 controller ON as well as the wheel ?. And that shake of the wheel is normal for the G27 to do that what you should do is hold the steering wheel with a firm grip so your arms can get use to the wheel. When I got mine I had the same problem as you but you soon get use to it. My driving settings are simulation mode. power steering ON, force feedback 5.Can anyone assist me new to G27 logitech set-up everything is connected and working fine accept that the steering keeps shaking and feels not smooth when I drive. Feels as if someone else is also steering any reason or setting for this.
Thanks Barend.