sprint - Normally, I don't like running 30k on the 1/12 cars. Usually seems too stiff and I always burn the rear tires off the car. I prefer that 15k Kyosho grease in the tubes and on the king pins. I also haven't seen many run the AE gold center spring, usually we run an AE blue with 40wt in the HB shock. Also, it may make the car push a little bit more but maybe something small like .005" extra shim on the front springs would help that.
Alf - Sounds good! I'm looking forward to the Birds and may join you in the 1/12 oval - I'm not racing on-road this year. Yes, I do think the Z4 wheels will be good in oval but we will see. We are trying to have them ready for the race. I will see what I can do with a rim for your order (not sure where it is in the stack currently shipping or shipped).
SuperMario - I will have to send you some pics when I get home, we mount them to the front of the shock towers like the Photon with the aluminum bracket.