Posted my first real videos with the adjusted head movement.
This is with the settings laid out above.
However after a week or so of driving like that I felt like some of the spark had been removed from the game. Some of the wild and crazy. So I changed the look ahead slightly to
Lookahead Angle="0.12000" //
Head Physics="0.75000" //
from within the game in the rate's tab. (numbers are different there)
It felt very odd with so little movement so I tweaked some more and have settled on this.
The head movement up and down helps loads with the butterflies. (getting them that is)