I thought I would add my FFB feedback.
I have found that turning the settings down quite a bit (i'll look what they are later) fixes the hard Jerking in a straight line. The problem I have is my FFb feels 'notchy'. I noticed it a lot when driving an indycar (road course). While turning for a long corner the wheel doesn't stay constant. It moves about. This is fine to an extent but it feels notchy and not very natural.
Also when driving down a straight the centre of wheel is very light and as the wheel moves very slightly side to side and meets resistance it again bounces back to centre. Im finding it very hard to explain but Im sure this could be fixed by increasing the resistance at center. You can actually replicate it at a much faster rate in the menus by very lightly with one finger pushing the wheel onto the resistance. The wheel will vibrate. This is the same effect as the wheel has a deadzone in the ffb at center
Sorry if I have made a dogs dinner of explaining it.
TX btw