Hi Trevor,
I'm going to start out with a similar setup to what I used last year, which worked fairly well. Due to the surface being quite rough, you need a fairly soft setup to handle the bumps (or should that be jumps?) I found that in the rear, white springs (the soft ones) with 40wt oil, and in the front orange springs (soft) with 50wt oil worked well.
You'll also want to run more ride height than usual, probably about 7mm. The G+ kit is a bit different from what I ran last year, so some things may change.
Tyre warmers are very useful if you can find, or make some. Otherwise there are plenty of people around who you can borrow off before your race.
I'll be happy to help out when we're down there.
Craig