I've got what I was after now. There's probably many different ways to balance things, but reducing light intensity from 0.05 (5%) to 0.02 and changing the edge blend inner color to 192,192,192 (and outer to bright green) look good to me.

I had some problems because my point light was directly in front of her arm. I tried changing various things without success, and eventually side-stepped the problem by simply moving the light!

Once again, thanks for the great tip Connatic!

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).