Sadly I'm not to be lumped into the class of those who might be better with the math.  :(  Hoo boy.  Unfortunately, low to high is the situation that needs something like this.  High to low is what is currently working, at least with meshes which are fairly similar in shape and position....

These internets, they need a math search engine.  The Googles and whatnots are not helping me find math learning resources.

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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.