Not a bad first youtube vid at all. You have a natural style. It was informative without the extraneous nonsense. Like you say, the audio quality leaves something to be desired, but it gets the job done. Maybe consider a little more thoughtful preface as to the gear you use if for no other reason than to anticipate questions that will come down the road.
I had never played a short scale until about two months ago. I found a shop in Brooklyn with some 60s Duo-Sonics and Mustangs, and thought "why did I wait so long?". I have smaller hands, so the scale length is perfect for me. I'll keep your thoughts in mind about the sustain. Thanks for sharing.