Try this, plug your Bump_Map node in the Material Room to Bump rather than Gradient_Bump.  Also connect it to Displacement just to see what you get.  Make sure that Use Displacement Map is ticked on in the Render Settings.  BTW, what is your unit of measure set within Poser?  It doesn't look like there is AO applied; Poser versions before P7 respond better with AO set up in materials.  I would keep shading rate @ 0.2 and conservatively set the pixel to 5.