Ermmm... for those who think 2nd gear is "faster," it doesn't work like that. You're actually making better use of your engine's torque in 1st gear all the way to redline and then shifting to 2nd rather than shifting at lower RPM or starting in 2nd (what?). There's a big thread about this in the track/racing section.
Now, as for your run... it has to do with tire pressure, temperature/humidity, weight, wheel spin off launch, time to shift, etc.. I'm not sure if the shifting is quicker in the autos when DSC/DTC are completely off, but I would imagine it is (or Sport mode or wtv).
At the end of the day, a good launch with little or no wheel spin and fast shifts will get you the best time. It's tricky and your clutch will die while you practice, so don't bother. Learn to steer around corners instead
