A friend of mine, who is a gunsmith helped me out yesterday on this.
It took a while, before we figured out what was wrong.
We have the suspicion, that the previous owner, a security company, worked on the sights to make them work better for close distance shooting.
When the pistol was turned back in to the company by the user, they must have changed the sight in some way.
Then of course the sights didn`t match anymore, for some reason.
So yesterday we took a bore sight laser and aimed at a normal ring target.
Holding dead center, the laser came in between two and three rings low.
So we did just what you said.
Lowered the front sight even more until it matched up dead center.
I will see next week at the range, if it is fine now, or not.
In addition we blued the front and rear sight so prevent reflection and corrosion.
This did kind of make me a bit mad, since we tried mounting a LPA rear sight, that should be compatible with the original front sight, but just didn`t work out.
In original the front sight is in average 3,2 milimeteres high. Mine was at 2,89 or so.
We will see next week, how it works now.
The rear sight installed, is the original one, when I got it from the gunsmith, but that dosn`t mean it is the original one it was shipped with.