yeah, all i can say is how i did it:
T/C OFF
S mode
Change gears manually using paddles at 6000rpm*
Had the back seats out and spare wheel - thats like 70kg
*Reason for this is because peak power comes at 5,700rpm and drops equally either side (+/-) of that. Changing gear drops revs by 1000rpm, so you have the peak power in the middle so your always at max power. I change at 6000rpm instead of 6,200rpm, which would make the peak dead in the middle of 2 gear rpms, because by the time the dsg changes your at 6,200 anyway.
Just give it a try, needs a bit of skill in the low down gears because the revs increase so fast to hit the 6000rpm.
Although, the fastest 1/4 mile on here (with additional mods other than remap) was done with t/c on and in +/-, letting the car change on its own.