You don't use dynamic mode for HDR? I found "dark" titles like Daredevil unwatchable otherwise on my Q90Rs.As well as Prime, Disney Plus, and other sources. I feel HDR is kind of broken all the way around, and I wish Samsung would have built more adjustment tools (like some other manufacturers) for us to better compensate for these issues.
On my Q90R, I typically have to crank the gamma up to 3, CH to high, and LD to high to compensate for the "way too dark" HDR titles.
I run all my panels in dynamic, anyway. My Q90T is the only panel that seems bright enough not to need it.