After taking advice and experimenting though I'd share some info for people with a Logitech Steering Wheel Set.

Tried and tested on my DFGT Wheel and PS3

For strong force -

Steering Dead-zone = 0%
Steering Saturation = 85% (This setting allows you to match both wheel's range of rotation, with 100% meaning that the full DFGT range (220º) will correspond to the game's 186º. That means the most appropriate Saturation setting, in this case, is 85% - This should reduce the real wheel's 220º range to 187º, in order to match the game wheel almost exactly)
Throttle Dead-zone = 0%
Throttle Saturation = 100%
Brake Dead-zone = 0%
Brake Saturation = 100%
Environmental Effects = 80%
Force Feedback Strength = 100%
Wheel Weight = 100%

High grip feeling (what I use) -

Steering Dead-zone = 0%
Steering Saturation = 85%
Steering Linearity = 50%
Throttle Dead-zone = 0%
Throttle Saturation = 100%
Brake Dead-zone = 0%
Brake Saturation = 100%
Environmental Effects = 20%
Force Feedback Strength = 40%
Wheel Weight = 30%