I -think- that the Sarah Spriteling set uses magnets to deform certain parts in Poser, and magnet values don't tend to translate over well. The only solution I can think of is to get the figure set up as you like, then export the changes as a full body morph target. That way you can add the deformations back in one swell foop, and Poser should translate such a morph target into Vue with no trouble.