looks like the same video to me, i thought you were going to a post an old swing and new swing... personally I would look at how everyone of your swings ends and that is with you rocking back and forth between both feet. It seems as if you never get your weight transferred out onto your front foot, looks like you transfer some weight but never fully get it transferred over which could be causing the rocking back and forth. It also looks like your back foot is facing the 3b dugout, if you were to point it inwards a little bit it will allow for you to rotate more...