Tobias,
Let me be brutal: I don't think you have a screw problem, that is a contrived explanation, but if you feel you have veiling glare, then you quite possibly really have veiling glare. People who use optics often end up knowing what they want, just like people who play musical instruments often end up knowing whether their flute or piano is in tune.
Whether veiling glare is an issue with a batch of Nocts or a fault of your glass only is a different question which is irrelevant here. Send your instrument back to have it checked out. Or if you really want to know, send your instrument to one of the experts on this forum who have a measuring setup and can test for flare and transmission objectively.
While trying out the Noct the first time, I was dazzled while watching corvids against a white winter sky; I still remember the sensation because it was unexpected and unpleasant.Two days ago I had a very slight impression of light intrusion, whitening, whatever, when comparing the Noct to the Retrovid. The Retrovid seemed somehow to have a touch more contrast, while the Noct had a more full and 3D image. But my eyes are 64 years old and probably full of cataracts, and it's perfectly feasible that this is not a fault of the binocular but a relative of the same perception which I have when walking straight into the sunset. In any case the Noct I tried was hugely superior to my own Victory Pocket
Sometimes I think it's better to buy a decent priced midrange object in order to be continually surprised by what it can do for you, rather than some alpha object that surprises you with its faults ...
On a sidenote I'm writing this on a computer I fixed, and although i could get a new one, every minute I squeeze out of this one now feels like an achievement
Edmund