I saw something in the first video I guess everyone else missed - stop holding the fly line pinched to the rod hndle with your casting hand. Hold the fly line with the line hand, and the rod with the casting hand. When you get comfortable casting the line you have out already and get to the point that you can "shoot" some more line on the forward cast you will have to get all of your timing down AND try to let go of that line with your rod hand - hard enough when starting out without handicapping yourself like that. It's a common beginners mistake, so don't sweat it, but stop doing it before you have another bad habit to unlearn.