No FB here.
RE: lock down. The timing of that is not critical, as long as you take into account your air cell size. On day 14, the chicks start positioning for hatch. So, if I've been incubating them in egg cartons, I take them out of cartons and lay them flat on that day. Your air cell size should determine when you increase your humidity, but any time after day 14, you can, in theory stop turning your eggs without issue. I do continue turning for a few days. but mark the cells one last time prior to official lock down, and also mark the probable pip locations if the cells have started to draw down.