Don't judge me to much this is my first foray into autocross. The event was a "Come Try Autocross" day, for charity. I did six runs overall and was pleasantly surprised with how my car handled. I had about 8 clicks left on my shocks and will play with that more next time. All in all it was a very fun day. I'm considering getting another set of stiffer TB but I am still undecided. I think i'll just drive it for a while and see what happens.
Mattax has some great advice, I don't think I'd change a ton on that car at the moment. Just drive it and get comfortable with it's capabilities. The body roll didn't look bad at all in the video's, and the car didn't seem to be understeering a bunch either. I don't think there's any reason you need to change the torsion bars right away. The 1.03's may be a little smaller than what you want for an autoX car, but that also depends a lot on your tires. And if it's just for fun it doesn't matter a whole lot. I think you're right to just run the bars for awhile and see how you like them, you can always change them later.