The tires were fine - Jeff and Paul prefer the 275s in the rear - my own personal shortcomings (I like big tires) won't let me try that yet, even though it is probably better.
One weird thing I have is the Hankook RS3-V2s in the front and RS3-V1s in the rear. The V1s like (and tolerate) heat a bit more, so I was always trying big starting line wheelspin, which kinda hurt me. My V1s are only 140 treadwear, so I'll be going to V2s in the back for next year, assuming the car doesn't get moved out of CS. Overall I think the V2 is a better autocross tire though, which may explain part of why my car is actually not too pushy.
Here's some video of my runs.
Day 1 (west course)
https://www.youtube.com/watch?v=RiygL6aH_J8
Day 2 (east course)
https://www.youtube.com/watch?v=z9K_0GTwYZs
Day 1 had a big obvious mistake that starts with a massive miss of an apex, and a few other parts where I was just going too slow.
Day 2 there weren't any obvious and huge mistakes, just 4-5 smaller ones each .2 - .3. Add all of it up and you get the big delta from Jeff to myself.
Congrats to Jeff Stuart on his National Championship, and congrats to all Z owners for making CS such a fun and successful class this year!