Good for you!
But remember: It is just moment in time, Just try to switch off the TV and Switch it back on, You will see that Color Space RGB will revert back to Low and or sometimes (Sporadically) it will re-negotiate back to what the lowest EDID your TV has which usually defaults to 720P/60Hz RGB Low.
IMHO it just does not know how to remember user settings when it comes to RGB Color Space settings even if you switch HDMI inputs on your TV.
It is a BUG… I can recreate it at will 100% of the time as I always set mine to 1080i/60Hz RGB High and it always reverts back to 1080i/60Hz RGB Low
