The flourishes were good. Sure, they need some refinement, but what you have so far is looking great, practice will only make them look amazing. I don't have any experience with flourishing, so I can't comment on the technical aspects.
Two things I wanted to comment on:
The False Riffle - The fact that the cards are shuffled but never squared is incredibly suspicious, and I strongly disagree that your spectators would "lose interest" and not find that unusual. Practically every spectator you will perform for knows how to shuffle a deck in some way - and NONE of them have ever seen it done like this. A false shuffle isn't supposed to LOOK like a false shuffle. It's a great start, but the final move needs to be worked on. Take a closer look at Oz's handling of the shuffle - and notice how his hands move in to help cover the move.
I think the angle of the video plays a large factor in this, but I thought I would mention it. It's possible your move could be invisible from a top down look, but from what I see here, it's noticeable.
I understand your viewpoint, but like with your ECC - I think you might underestimate the spectators you perform for. You mentioned that since they didn't question things, they didn't see it. I think this is largely untrue. More often than not, a spectator will forgive the flash and never mention that they saw your double or something like that. Always remember that. They're not dullards - they're just nice and forgiving.
The second comment - on your shapeshifter change the move is too obvious. Don't bend the card so dramatically beforehand, it gives the move away. It should be a quick "flick" like you're just snapping the card.
Nice work - keep it up!