What is adjustable in your setup?
Camber (F / R)
I would go with a nuetral to slightly understeery balance on a course like that. You want to be certain that any rear-end rotation that you get it by design, and doesn't just creep up on you out of nowhere. Keep your tire PSIs within about 3-6 pounds of each other, depending on how everything else is setup.
Don't waste another minute waiting on parts, or anything else. Just get out there and start racing! You will suck at first, and you will be slower than many other cars, but the only thing you will regret is not starting earlier...