i use Blender for morphs, and i've never had a problem with vert count.  that said, i used the Poser export settings i got from tutorials i no longer remember and are long out of date.  probably for P4.  and haven't really done much exporting for morphs since.  that was a while ago.  i got my Blender import and export settings from other tutorials for version 2.49 or earlier.  i'm betting if you look up FBM and Blender, you'll get a pretty good tutorial by Paolo (Pret-A-3D, creator of REALITY), that can be easily translated to the current Blender and current Poser for the creation of the morphs.  creating the FBM in a cr2 is basically a single menu item in PFE.  that is, no real steps.  for the FBM, i think i just grabbed the Geometries folder version.  though the PFE help seems to say it supports partial mesh, as long as its grouped.  i haven't played yet with converting that to an injection pose, but it should be possible.  i'm just not sure i have quite the grasp of PFE yet that i should.