There is NO horizontal adjustment possible.
I read your post in the HID thread saying you have HID bulbs. That is probably your problem. Those HID bulbs are bigger than filament bulbs and are not matched to the reflector. Probably not centered. Try putting the original bulbs back in and see if it fixes it.
Owner of "Campbelle", a Brazen 2008 GXP ... with mods piling up...