[old_tv_nut]

"...the issue I'm looking into is about how in low light scenes it's almost impossible to get true blacks and instead all black levels are more or less levels of grey with some very close to black. Where as in bright scenes, anything supposed to be black, is black."

Conversely, if you set the "brightness" control for correct blacks on a dark scene, shadows will be clipped on a bright scene.

Some later sets that had full DC restoration relabeled the controls:
The DC bias control that had always been labeled "Brightness" was relabeled "Black Level", and the gain control that used to be called "Contrast" was relabeled "Picture."