Dumb question: I noticed that you turned off the choke right away; why aren't you using the choke until it's warm and idling at a normal 1200-1400 rpm? Then it won't idle at 1000 rpm and die at stop signs while cold.
Gust of wind makes me think leaky intake, not carbs.
Have you taken it for any rides of length, not just farting around your neighborhood?
EDIT: also, watched the video again. 'Casually accelerate'? That's your definition of casually accelerating? dude... be nice to your bike when it's cold.
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