nogahorovitch The image is not uniform from neither angle, there's nothing you can do to avoid the low spot-bright spot.
The older versions were detected to flicker only below brightness 5, now it's 15.
Whith all theese, and all the image proccessing disabled, it's still not a work setup. To me, after a while, it gives the sensation of want to change the picture, anything, as in no peace to the eyes when watching it, the burning need to do something and dry eyes.
Maybe it's because of the high brightness not able to be uniformly masked by the crystals, maybe the dithering. The pwm is measured and not present at 15 and above.
Btw I'm looking too for a setup, tv or monitor of 50 for work and so far I've found none. I had an old 55 Sony TV that I could use for long periods, it gave mild to medium headackes after a while, but I can clearly remember that the eyes were moistured. Model impossible to find anymore.
I recommend to try older models from 2015ish, I once found one in a pawn shop, flicker free, didn't pick it because of poor color representation