Everyone uses Flow differently. Some riders like to pre-tighten so much that when they kick in their heel is left extending a few inches over the reclined highback. They then lift the back, stand down with their heel, and slip down the highback into place. Others leave things very loose, kick all the way in, and take a couple of ratchet swings while getting rolling. Some aim for a middle ground like you have in your vid.
Is it common for people who overtighten their bindings to get a "pinched" sensation in the heel area as the highback is squishing the back of the boot? This had the added negative of sliding my entire foot forward in my boot and slowly pushing my toes into the front of the boot (they are still pretty sore now).