A couple of things that I noticed doing some "testing" last night on my wife's Sport:
-I turned off traction control. With the car brake torqued to the stall speed, the front wheels would chirp and I could feel some rotation, maybe a quarter turn, before the power was directed rearward. I am sure if I had TC on that it would have cut power for a split second.
-The stall speed of the torque converter is about 2,500 rpms.
So it would be interested if you re-tested your vehicle with traction control off and increasing the launch speed to ~2,500 rpms.