Thanks Guys, some good ideas to try out (not all at once though!
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Sosidge, I was surprised by your comment ride height. I would have thought a lower ride height and lower centre of gravity would have helped reduce the grip roll? You almost certainly know more than me though so I will certainly give it a try!
I am already having to be quite heavy on the brakes as if I try to scrub speed off by sliding it just goes over. When I was watching the other 4wd they were entering the corner at the end of the straight faster and were sliding a little in the corners where my car would just bite and roll if I tried to do that.