just as a side note for the set up the track was extremelly high bite at the start of the event the bite was a little lower and I had on 17.5lb in the front and 12.5lb in the rear with everything else the same.
The steering rack change is kind of wierd to explain it, the car reacted faster in sections like the chicane but felt smoother and more consistant everywhere. Normally faster reacting means twitchy but it wasn't at all. I would defientely give it a try.