It's not my technique, it's Smith-Micro's. I'm merely following directions. Not sure why it doesn't work for you, or how you export a morphed shape as an OBJ without clicking Save As Morph Target.

As for including groups, there is certainly no harm in doing it. For me, it's unnecessary if all I'm doing is exporting one morphed body part because I just select that part of the body when I load the morph target.  For a full body morph or several body parts, groups should definitely be included so Poser can sort out what goes where when the morph targets are loaded.