Nerd might have some idea of why the weights handle better with the animatable origins.  I recall that his tutorial video did show the benefits of using the weights over the zones.  Perhaps the problem is that the zones themselves aren't animated?  They're separate objects with set positions and the morphed mesh moves out of their influence areas?  Whereas the weights are associated with the vertices themselves and will adapt when surface deformations move the vertices.  I think maybe he explained it in the video and it was something like that.  :unsure:

===========================sigline======================================================

Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.