Flat top pattern and flipper inside.
There is one possibility re your HID headlights - that the flippers/shutters inside are not flipping up out of the way to provide hight beam.
In brief, the round lens that you see and the internal reflector within yield what I would call a high beam light with a flat top pattern. This flat top is more pronounced when on low beam. You can see the flat top when parked say 10 ft from your closed garage door or a wall.
To get low beam, a metal plate or shutter drops down or flips up inside each headlight assembly and blocks off some of the illumination such that the light that escapes from the lens is effectively "low" beam with a very pronounced flat top - actually a flat top that angles up to the right so as to illuminate road signs. This shutter or what I call the flipper is the bi in bi-xenon. A xenon HID does not have the shutter and usually just generates either a low beam or a high beam pattern, but not both.
In the 3, high beam is a combination of the full output of the two 35 watt D2S xenon bulbs plus the turning on of the two lower and somewhat inner located 55 watt H7 halogen bulbs. It may be that the HID flippers are stuck on the low beam so your high beam is effectively just the two H7 bulbs plus the light from the HID's stuck on low beam.
I have not heard of both flippers being stuck at the same time but having one flipper stuck is not really rare. I suggest you park in front of a store window and play with your high and low beams and see if you can see a change in the HID's when the inner H7's illuminate.
If there is no change in illumination of the HID's, I think the circuit that tells the shutters to operate may not be working as having both stuck is unusual.
About all I can say is the not HID's lights are like a normal vehicle and the HID's when working properly tend to turn night into day, particularily in the winter when all is covered with snow. As mentioned in a previous post, it is not so much that the lights shoot further ahead as a more even greater width of brighter light is provided.
http://www.**************/gallery/thumbnails.php?album=3801
Substitute for the ***** the words disco3 co uk with a period in each of the two spaces. There is a file that may be of interest related to the D2S xenon bulbs.