I would try raising the cutoff distance and number of influences, at least to see if you can coax the process into giving you better results.

I don't use either of the figures you're using here.  I assume M4 is pretty hi-res.  How does the mesh density of Renithra compare to that of M4?  Whether you're comparing "uphill" (low-res source to hi-res target) or "downhill" (hi-res source to low-res target) can make a difference in the results.  You may want to try running the comparison with raycasting activated, at least to see what different results the changed settings can offer.

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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.