Richard, you will get plenty chance to fine tune your Spax settings at Curborough
Can't remember how many clicks, but mine are set quite firm at the front, and quite soft at the rear. If its a wet track I've found that setting the rear shocks to their softest has given improved grip
I've always had the ride height set at 150mm from the bodywork to the floor, but think I'm now going to experiment setting it a little lower for track use.
Tyre pressures seem to make quite a difference and are definitely worth experimenting with.
I'm no expert in any way shape or form, but have found that tyre and suspension settings come down to personal preference at the end of the day....so start experimenting!!