I don't really want to watch a 25 minute video so can you summarize the leak location? Is it the atmospheric vent hole that you subsequently mentioned?
I know no relationship between a bottle being removable or not and the likelihood of the regulator leaking. It's going to leak if an O-ring is bad (damaged or wrong size/material/durometer) or the surrounding surface is in poor condition (rough, scratched, gouged). That's it really.
Any O-ring that needs time to swell before it seals is masking one of those problems, and is sure to be problem that resurfaces prematurely. A properly fitted O-ring will seal immediately by shifting toward the low pressure side and pushing against the extrusion gap.