Riffle Stacking:
A little bit of hesitation on the drops. But I have that aswell. A little tip if you have to hold back larger amounts of cards:
It helps to conceal the block of cards if you let the cards spring forward a bit. If you're familiar with the zarrow shuffle you know what I mean.
Miller Shift:
One of my favourite moves. You did it nicely. Looked good!
Bottom Deal (take my advice with a grain of salt as I'm also no where near where I want to be with my bottom deal):
The thing that threw me off was that you only used the first and second finger for taking the tops, but when you dealt the bottom card you started to use your ring finger. I'd suggest that you stick with one taking action. So either you always use all three fingers (no matter if you deal a top or a bottom) or you only use index and middle finger. But your rhythm already looked quite nice
Shuffle Production:
My only advice would be to do the production slightly faster. Apart from that it looks nice
Regards,
Joey