It may not help, but there have been a couple of posts from users of LG 4K sets with "HDR Pro" variants of the HDR process, which have reported similar dimming issues. I believe there were some manual adjustments that could improve things from memory. I also can't remember if your is an 8 or 10 bit panel and if that makes a difference too. All a bit sketchy but just trying to recall from memory......
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