I am STX also. (Mods are in my sig) I am running 46 psi front and 40 psi rear with Ponza RE 01 Rs, stiff setting on rear sway and "soft" on the front. For Auto X I turn the dampeners to full stiff.
The DSG is great because you have both hands on the wheel at all times. I took a class lass weekend and the instructors where all impressed with the DSG. I did not use launch control at the start because it was a turn. I still burnt enough rubber.
I think you need to find someone with your same tires to get a goos reading on what psi to start with. One of the AutoX expert's in my area said his friend is running 50 psi in the front.
The first pic is of my launching, you can see about $30 of LF tire turning to dust.
The second pic is of me going around a cone at speed. Not much body roll and the tires on the driver side are on the outside of the turn.