In addition, and I hope you don't mind the criticism/ advice.
The initial control of the selection is a finesse control, and because your overall handling of the deck is a little bit unpolished (fumbled), it seems really out of place. A simple double undercut would go unnoticed and actually flow a bit more nicely into your routine. I know you really want to use the new control because you put the time into learning it (trust me, I know this urge), you need to improve your overall naturalness with the cards in order for it to work.
In order to do so, this is what I have noticed:
Try and reduce the amount of flicking. You tend to flick your cards with your thumb in order to prove that it is a single card. In reality, the laymen would assume you are only holding a single card, thus doing so is completely unnecessary.
You also seem quite tense when you square up the cards. Whether it be the entire deck, or just a small packet of cards, your squaring up motion should be smooth and continuous in one nice natural movement.
Your cards are a bit old and tattered, which definitely makes the various sleights more difficult, so that is probably one small reason for the tense vibe I get from the video, but slow down a bit, and make your movements more subtle and smooth, and your initial control choice will be more valid/ natural.
Until then, I truly believe a simple double undercut is the way to go, and will actually improve the overall look of the performance.