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Related to that issue, I think I'd look at changing your close-vert-gathering code to never cut off less than 3 vertices - regardless of the tolerence value - that should help avoid some of the more extreme piggy-backing.  WIth only a single vert, it's going to use that vert's location.  With 2 verts, you'll end up on the edge between those 2 verts somewhere. With 3 verts you get some play off of that edge and each target vertex is going to be a different distance from those 3 verts (even when they come up with the same 3 verts as thier 'closest'), so there's less clumping.

I understand your logic, but I'm not sure how to force that result in all cases.  If a Target vertex only finds one Source vertex within the threshold distance submitted, then there's only the one vertex within that range.    Are you suggesting that the process should try to extend the range and loop again if fewer than three matches are found?  Or that the user be prevented from entering a Number of Influences setting of less than 3? 

I could see a reason to keep the option for only 1 influence per vertex.  If you want to transfer morphs between two identical meshes, when one of them has ended up with a different vertex order or something, a Number of Influences = 1 setting will match the identical vertex locations properly for transfer of identical morphs.

I guess I'm not altogether sure what you're proposing, although I can see how it would be beneficial to always have at least three weights per vertex. 

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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.