Sorry no idea - I did try a few G3 hairs in Poser - the few that actually loaded into Poser without errors or crashing poser wouldn't transfer custom morphs created either in Poser or via Goz.

If I set up the custom morph in Daz the DSON transfer active morphs do work on the hair, I can only surmise that when you set up the morph in Daz Studio the extra info added by Morph Loader is used by DSON some how. - I was able to add the Morphs using the Poser 'Copy Morphs From' command as a last resort when I was totally annoyed by it, lol.

I didn't try changing the dependencies or try 'post transform morphs' all of which could come into play

I've started to avoid DSON as much as possible now and prefer to import the object files - especially Hair and Props