confidence in your self I suppose. I've heard of people running mid to high twelves with big turbos. And then i know a guy who with a ~stg iV-V Z ran a 12.1 w/ slicks, and 12.3 w/street tires.
I don't doubt with your setup that you can hit low 12's or even 11's. Just practice the hell out of your launch.
BTW did you ever computer automate your lanch yet. I remember you saying something about that at one time. And i've seen devices for manual cars thad do something like make a temporary lower rev limiter to build boost off the line in the same way an auto can. I don't see why your computer couldn't do the same, if it doesn't already.