There is a freebie utility called Scaler3c. I think it might still be at Renderosity. Search for it here, or on Google. It will do the rescaling for you.

It's strange that the head morph obj appears to be the same upon import. Usually when the head morph makes the head fly away there is a difference in its size or location. I don't use sculprtris, but other Poser users have had success with it.

Download my free stuff here: http://www.renderosity.com/homepage.php?page=2&userid=323368