It may also be a stupid answer but are you sure the lamp isn't installed upside down?

Actually it fits only one way - and DOT markings are supposed to be on the top - and they are.

Bend the bracket...

Well, I said it may be a stupid answer. I have heard of people getting them in upside down. I'm not sure how.

No, nothing stupid about this answer.  It was the first thing I checked after having adjustment problems.  Cheers.

Thanks. I am going to the bike now to see exactly the whole bracket.  Maybe, instead of bending it, some shims would be better...  I hate altering something when it doesn't need to be altered.  Good to know that it is bendable, though.

I examined the bracket a moment ago - instead of bending the bracket (which I would hate doing) I can put some shims on the 2 top screws, which would change the angle of the bucket as much as I need, if I need it.

I also found out, that I have still enough of the adjustment screws left to lower the beam.  

So, I am set.  Thank you all.  My next project will be changing the turn signals for brighter LEDs (with balance resistors of course).
Cheers.