Hi SS,Hello Ted.
That's very nice of you.
This has been my rule of thumb.
All 4000 nit titles use a black floor of .005. 1000 nit titles from Universal also use a .005 black floor as they were done with the Pulsar but mapped to 1000 nits instead.
Unlike projectors are LG OLED's map to content, so the floor should not be a issue.
Sony BVM-X300 30inch 2160p OLED (1000/1100nits) they use for 1000/1100 nits mastering.
It's not sure what LG's are doing for the min black level info they get from each movie metadata.
So when you have a movie mastered with min 0.005 nits and you watch it with OLED which has 0 nits, it's up to the display internal programming what to do....
BT.2390 (which is not a published standard, it's a report) it has a minLum parameter to do a normalize counting to the display real black measurements but even if a display will follow that minLum parameter (which is baked inside to a display data)
You can test this to see if the mastering display min number of metadata is affecting your display response, if you have HD Fury Linker and send a custom metadata which will be the same as the movie's you will test but change the min from 0.005 to 0.000 or to 0.01.....when you have a paused dark scene of the movie, sending different values you will see what the display is doing ...it will change the picture instantly if it's counting the mastering display nit to its internal baked calculations.