is220dphil

I am experiencing a flicker on the right hand beam at idle but goes away when the engine speed rises. I hope it's a loose screw but now I'm worried it could be something else and more serious. Anyone else had the same problem? On the positive side I think the AFS system is fascinating, and when driving I just can't wait for the next bend! Can anybody here on the forum tell me how the system dynamic adjusts the beam height and swivel? The headlight beam on my IS220d seems to point a little lower than optimum (although not an MOT failure) is there a manual adjustment facility to raise the beam. When AFS is switched on there seems to be a hole in the spread of beam covering the top central part of the road (boss eyed beams), can my Lexus dealer adjust this accurately during a service to provide an optimum spread?