I went through basically the same thing with my first day one 13PM although it had more of a green tint issue mixed up with non uniformity. My second one is much much better, I’ll link pictures down below. The second one has a Samsung G9L screen, the first one I didn’t check unfortunately because at that time I didn’t even know there were differences in the serial numbers. my G9L is still not 100% even but as far as I know there isn’t a perfectly even OLED panel. First two pictures are my current 13PM at low brightness displaying grey content and the last two pictures are side by side comparisons between my faulty first unit and the one I currently use. I think I’ll keep my current G9L one!I love the 120hz, but have noticed after a few days that the screen uniformity of my 13Pro is significantly worse than my outgoing 11Pro. This is especially evident at night with low brightness (say 10% or so). For example, in Apollo the left to right, green to red tint is extremely noticeable and irritating. I am going to return this unit but may wait a few weeks (months) for the factory to improve on this. Unless this is within tolerance for OLED displays and you have to just live with it, which would really suck since I'm not looking forward to playing the panel lotto.