Really enjoyed your video, nice production. As for efficiency, any process can be made more efficient. Currently down to one working eye so the world is a bit blurred and without seeing the unedited version these are only general comments
There is lots of walking around the car, although it does not sound like a lot of time, it all adds up. With pen & paper or any other method, draw an outline of the car and watch the full process and draw lines which match how often you move around the car or go somewhere else.
I would put the bottle of Optiseal in your pocket, carrying different things in your hands is not efficient as it increases the chances of something going wrong. Even better, get a toolkit belt.
I would adopt a standardised approach to washing each panel, humans seem to be poor at doing this, we will over wash some parts and just give a quick wipe to others.
Most good efficiency improvements come from making lots of small improvements, it is the cumulative result which give the best results.
I would suggest washing, drying etc each panel before moving onto the next one if you wish to save even more time. This approach seems counter intuitive but it does work.
One day I really should make some YouTube videos on detailing efficiency, perhaps there is a market for reaction detailing videos?