@RvSeok
Thanks for your response.
Our LED redner nodes go directly to LED Processors but we are using EDID file loaded into nVidia Control panel and I get 24Hz in Stage monitor just fine but we get ocasonal frame drop which for VP is a no go … so I am still trying to come up with version of EDID that will give me smoth 24Hz rather then “most of the time”.
If you can export your EDID and share it with me , I could at least compare my settings to yours and find that missing settings so that no frames are dropped. Feel free to DM me rather then posting in here if you don’t want your EDID to be visible to anyone 
Thanks again
Maciej