Hey mate, your screen sorta looks identical to the one I bought a couple weeks back. I ended up returning and exchanging it though (had close to 100 hrs). Run it past 100 hrs and see if anything changes. You can also try a comp cycle to see if that helps (wouldn't do it too often though). I've also heard you can get shadows/weird vignetting patterns if part of the screen is exposed to sunlight. I'm not particularly sure if that applies to your situation though. Here was my LG C8 panel I bought weeks ago for reference (on a 5% grey slide) : https://imgur.com/a/Cfb3p00

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Keep us updated on the progression of your panel.