My hands are far from tiny, but this is really helpful information!
I always think about my technique on the top side of the fingerboard, and my right hand, but never the thumb on the back of the neck.
Perhaps there is something wrong with my left thumb technique, and the girth of the bass necks that I usually play are allowing me enough slack to compensate.
I will do some research and maybe clip a go pro to the back of the headstock during a practice session, then review the footage.
Thanks so much!
When I started to teach a few people on the side, I tried to find a few infos on what some good posture would look like - and how to explain it to especially younger students. The videos from Adam neely are old, but gold.