tranny brake ....need help

New guy here,Glad to be here!
I would keep working with the carb.You might need jet extensions in the rear to pick up the fuel when it hits the back of the bowel.Remember when you footbrake, your getting that nice fat pump shot.If you use T/brake and/or delay box your decking it before you leave the line and your pump shot is gone.It might just be not getting fuel.