Thanks martinsalat I'll give it a try.
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I'm assuming that the FFB system had changed in this recent patch as I had been playing this quite a bit upto about a week before the patch came out. About 165 hours since day of release. I had the FFB for cars that I like driving all set up to the best of my ability with the game as it was pre 2.5. I come back to the game this afternoon and everything feels wrong. It's as if I'm driving a shopping trolley or driving on ice. No matter what I tried it wouldn't feel right. I selected classic instead of default and it immediately felt better even though all the sliders in the main menu and garage had to be set again. Now I almost have the car I was driving today back to the way I like it even tough I've spent about 20 mins on it using CLASSIC instead of 4 hours trying DEFAULT.
That's why I assume it is now a new FFB system. Although I could be wrong.