It might help to "clean up" the morph in Poser. Import the .obj as a prop... position it properly by dial (change dial sensitivity by double clicking the dial to bring up settings or use ockham's dial sensitivity script from Freestuff) and if you set the head element preview style of the figure to outline you can see better that you are lined up just right. Then you can fix any crumples with the Poser 7 Morph Brush, export the morph prop as a new .obj, delete the prop and import the "fixed" .obj back in on the head as a morph.

BTW I have "smile" morphed and "open smile" morphed heads I use in FSP since those match better the photo sources I find most often.