Hmm...  good point.  After I saw that I found SVDL's script to delete unused morphs and tried it out.  Took a 110 mb pz3 down to 16 mb.  After seeing that work, I put together a pz2 file from all the V4 injection poses to inject all the morphs back in, it worked perfectly.  Now I just need to learn python so I can do all that automatically!