You could still try simply not setting any deltas at all for the weld child vertices, at the weld seam.  If the parent sets the position, any child vertex deltas should be unnecessary, only running the risk of complicating matters.  Maybe. 

Poser has the gremlins, as I've stated many times.  :lol:

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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.