I went to the Michelin autocross in the white car again and placed third overall out of 41 car, definitely wasn't expecting to to that well.
Link to full resolution results:
https://imgur.com/d7XRaOy
I also finally found and bought a big-nose engine for the red car. This will let me run a Fluidampr harmonic balance so it'll last longer when revving it higher than normal.