If you're using the ST Chassis or even the original really short chasis then start with 80 weight oil all round, Medium roll bar on rear, Stiff on front, Green Springs on front, Black on rear and standard everything else. The reason for setting the car up so stiff was to keep it on the ground!!
Gearing use 10/49 with a 10.5 Novak. The Foams are all dependant on the type of carpet surface, I've never really liked them so would suggest starting with Schumacher Yellow Rally Blocks all round and seeing how you get on, Schumacher Mini-Pins could be an option although alot of Micro Drivers do not like them, coing from 1/10th I find them great
These were the settings I used at the last couple of Nationals and both were Top 10 overall, let me know if you need anythig else