So sorry for the late feedback. I tried almost everything now.
Pushed down PD to 0.5 (lowest), switched all other things to low, MSAA off, Supersampling 0
Switched ASW off.
If a FW passes me head on (flying in a P51), passing on the right or left I can see 3 FW 190 (one in the middle (dark) , one in front of the dark and one behind the dark one. The faster the object passes, the bader it gets...
If I switch on ASW then the obove mentioned effect is not that bad, but it looks like that the FW has got "flapping" wings, when passing me.
Very annoying, really!
Tried different Nvidiadrivers too...
Don't know what I can do now, because I am out of ideas. :-(