[niterydr]

Are you spinning in first gear? I am still saying get a speedo to the AEM and lets mess with progressive boost.
You could also switch over to the PROEFI stuff, their launch control setup is insane, huge in the Toyota community and fairly cost effective. (What the MR2 will get if I keep it most likely).

That viper I just tuned makes over 800lb/tq and hooks on the street on street tires with progressive boost setup just fine in 1st and more importantly 2nd gear when the power comes on, still gets light in 3rd when the power really comes on...but still its a cheap addition to your setup for now. (two sensors)

Heck, lets not even open up the traction control capabilities, granted its not individual wheel speed sensor based, but based against acceleration it could help shorten up that short track.