Xenon Headlight Aim, 2006 GTI MKV

I would like to re-aim the xenon headlights on my GTI. On low beams,
the cutoff is nearly horizontal - no drop. I'm accustomed to euro-
code lights, like Hella or Cibie that specify a 2" drop at 25' or
similar. The GTI's lights are flat on lowbeam and seem to point
upward into the trees on highbeam. So I'd like to adjust them
downward. I have the Bentley CD and about all it says is to use a
headlight aiming device. I also see that I need to plug into the CAN
bus to "do something" with the auto-leveling function. However,
there's a hex socket on each headlight assembly labeled "U" in one
direction and "D" in the other. Seems obvious enough, but I don't
want to mis-interpret U and D for up and down when it means something
else in German. I also don't want to hose up the auto-leveling
mechanism.

Any advice would be appreciated. Aiming headlights ought not require
a computer!

Torky