Congrats!
There is much more in your car.
Tire psi is one.
Practicing is another.
Probably one of the best things you should do is, nothing.... and keep on working at it. You could sneak into the 13.5 range.
LT1's are tq monsters for down low.
I would avoid doing gears for now because you won't hook for ***** at that point and you will need drag radials
btw, you still gotta keep up w/ me

I'm at 13.746