Gary,
Fantastic video, thanks for posting this. Your technique is so smooth and fluid it sets a new standard. I notice that you have no hesitation about going repeatedly over a section that has no visible lather. I've seen posts, and have a friend who has been straight shaving for many years who agrees, that state that you should never go over a section more than once before relathering. Yet I have found that to get a smooth shave I need to do repeated strokes, preferably from different angles, and I don't bother to relather each time. It would take way too long. In the DE realm I think the technique is called "buffing". I have sensitive skin but I can't really tell a difference as far as irritation goes, my skin is still slippery from the remaining soap even after the visible bubbles are gone.
Any thoughts on why some guys think the razor should never touch unlathered skin and have you found a difference in irritation with you, or guys you shave, with repeated versus single strokes at a give location? A barbers manual I borrowed from my barber stated clearly that you should start in the bare area and stroke into the lathered section as a matter of routine technique. There is a big emphasis on making a rich, thick lather on some of the boards, but I have found it mostly pointless to build a lot of lather up above the zone immediately next to my skin, it is where the edge meets the skin that matters- and that seems to happen at a very small scale, at least with a straight where there is no safety bar or comb that needs to be lubricated to glide smoothly.