Just did an 'ellipsoid' morph for the flame...

Whoops !  I forgot that the flame shader uses the V coordinate of the UV mapping of the flame mesh, and that UV mapping is a bit arbitrary - a simple cylinder projection

I think the default flame mesh probably needs to be an ellipsoid to start with, positioned as per a real flame in relation to the tip of the wick.

Obviously the UV mapping of the flame and the use of the V variable in the shader must be correlated

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The 3Dcheapskate (also available in DAZ and HiveWire3D flavours) 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.