Not promising that this will work, but give it a try and see. First make sure that all areas you want to be transparent are true black 0,0,0 and not a shade. In the picture you posted here of the transmap, the area that should be black looks more gray. Also try setting the min and max and fallout for the trans settings all the way to the right, 100%, and set the highlight color for the material to black. Then render in Poser and see what happens.