Disclaimer: I recently destroyed my adequate-so-far "intuitive" stroke trying to implement "correct" mechanics, so there are boulders of salt laying about...
In the spirit of constructive criticism my impression is lots of elbows dropping and tips flying. As I understand theory here shouldn't the elbow stay frozen and tip come to rest on the felt?
That said, a recent personal problem was head elevation and corresponding cue over-elevation (front and moreso back) resulting in micro-jumping the CB - Audible but only visible in a frame-by-frame review. I mention this because after looking at some 1/8th speed video of me and some friends everyone's waggling all over...
Also, having been there I'm seeing the same frustration I feel after missing the CB position - reverting to pre-shot routine after failing is hard. I found that editing videos is tedious but it allows me to shoot without camera pressure, and allows more constructive analysis from experienced shooters.
On both points your first shot was textbook chin-on-cue, and stayed that way, but my impression was the cue bounced around more as the clip progressed. Would editing produce a more consistent shot?
GL,
-G