I don’t know if mine has improved or not (thigh general consensus was mine is fine) BUT what I can say is I’ve stopped noticing anything and have to say I’m very happy overall with the display.
Reminds me of the punchline to the old Henny Youngman joke.
“The patient says, “Doctor, it hurts when I do this.”
The doctor says, "Then don’t do that!”
I have to say that I am really jealous about your displays (except the crappy LG 4K 27). My first Studio Display had around four horizontal lines in the bottom left quarter, vertically “stacked”. These were clearly visibility when scrolling on e.g. a website with a white background. Here a (heavy edited) image that shows the issue:
So I returned it and my second Monitor looked like this:
Especially the spot on the bottom edge on the first third is noticeably even in normal daylight on a dark background. I will return this monitor too and give it another shot. I don’t strive for “the perfect LCD Panel”, but I want at least a unit that has no noticeable issues during normal use. Wish me luck!
Personally I think you are going to be disappointed, you’re going to have light leak on your next one too. These are expensive monitors, but they are far from perfect. If I worried about light leak, I don’t think I have ever had a perfect display.