What are you using to rip the 4K HDR stream? I have a feeling that might partially be to blame. I don’t have capabilities currently to rip 4K BD. I would imagine if there was an option to not rip the HDR version, but just 4K, or if there was a LUT to control the blacks/contrast that you could ingest.
I couldn’t convert it from disk either. Someone did it for me. As much as I love the idea of redoing all my edits in 4k I think I’m gonna have to stick to standard Blu-Ray on this one 😦