Love the ASAT but the ergonomics not only made playing uncomfortable but I ended up developing tendinitis (asatitus ?) to the point that I couldn't shake someone's hand without pain. So I came up with the ASAT Strap Extension, pain is gone, and my ASAT hangs perfectly.
I sold a couple dozen around the world some years ago. Unfortunately, I don't have the shop or resources to produce them anymore.
Another option is placing a strap button underneath the neck pocket (see above). This solves about 75% of the neck dive issue.
There are those who have no neck issues at all with the ASAT so it's important to see how it works for you.
All in all a killer bass. I just needed to tweak things a bit to make it perfect for me.