Remember your posts about Driving hard.
Remember how mercedes cars especially newere ones tend to adjust to how you drive?
I think you are just a better driver than the others, and I think driving hard has made your car faster.
But really who knows, I'd consider that it is possible, but wouldn't your mech notice?
My car is the kind of car that drags until about 40, then really gets its wings and takes off from there.
Unless I brakestand and take off, but I'm skeptical about that with less than 2k on the tranny rebuild.