Do people find this gearbox 'lag' worse after a distance travelling at steady higher speeds? That's what I find, and I think it's because the gearbox/throttle/engine 'learning' puts it into an economy mode. It's annoying, and possibly dangerous, like when trying to merge into another lane and I don't know whether the car is going to respond quickly, or sluggishly.
I find when I tootle around for a longish period in suburbs, or light traffic, then the car is more responsive to small throttle inputs.
In my case at least, I'm sure it's not the hose issue, but the so-called learning inbuilt into the components...aimed at economy and possibly a smoother (older-person's) drive
Annoyed me more in my 335i. Maybe the X2's 7-spd DSG responds a little quicker, and the one extra gear ratio helps a little...