Good Review Ron,
I have a 2010 as well, and was experiencing the same LC issues as you.
Yesterday I realized the following. When stopped, by pushing the breaks very hard, the transmission seams to act differently. As if the front end rises slightly before launching (due to the tranny grabbing and preparing for the launch).
Have you tried pressing the breaks super hard?
The first day I got the DSG tune and tried testing the LC. I was not pressing the break very hard and was only able to launch at the max RPM. When I don’t press the break hard enough, my car feels like its just revving in neutral, but press hard changes things.
Try this and let me know what you feel, as I was only testing briefly with a bitchy, PMSy, anti-race’y girlfriend in the car.
I will try and do more testing tonight ( without my girlfriend )