ibins Black and white are both terrible key colors as you will always have near black and near white parts on the model. It is actually pretty creepy looking through transparent eyes in the middle of the face.
I notice it differs from video to video, I found one scene with a white room and it didn't work as well as other white rooms I've tried, must be something the camera and lighting too I guess.
But everything you mentioned sounds great! the new passthrough options with slr is in the early stages im sure everything will workout great with even way better visuals in time.