You didn't think of putting the switch down?...you know just for kicks? If I had to drive my truck like that I would have tried to figure out why.
I retract my previous statement...launch with a large amount of PSI and you will win...large amount.
Good luck on your race(s).
to be honest my truck was down for a new lift pump. and i went to hook up a switch to turn pump on and off and somehow i turned it on i guess haha. so how do i "launch" just prestage and hold the brake till psi builds??