Does the pose work in Poser 6 with bend on if only one body part is being changed?  The result you're reporting sounds like I've encountered in P5 when trying to do more than one body part.  Or, for that matter, two body parts, one after the other, using separate poses.

Kind of looks like the approach may only have very limited utility.  :(

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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.