I know this is an older thread, and I have not gave any updated info.
I got the car working and hooking really hard with the trans brake. I won the last 4 out of 6 races at my local track this year.
Going to put this info out there for guys having trouble. Just keep in mind that every car is different, and what worked for mine may not for yours.
So, after hours of looking on the internet forums talking about Caltrac tuning, I found a post that made sense to me. On a Ford forum a guy was having the same trouble that I was with getting his Caltrac car to work using a trans brake. Guy on the forum told him that they had found a transbrake car needs to be setup different with the Caltracs.
He said to put a nickels worth of air gap between the spring and the Caltrac bracket, and to run the rear shocks to the stiffer side.
Completely the other direction from what the tech guys at Calvert had been telling me.
I tried it, and I'll be danged if it didn't hook like a bear straight off of the trailer!
Nice and straight with the wheels up even on both sides. worked best with the shocks set on 7 clicks.
with the springs preloaded and the shocks so loose, the car was simply bouncing the tires off the pavement when the trans brake hit them. No different than a basketball.
Hopefully this will help someone else.