Personally, I would use Snarly's EZskin to replace the original shaders with something simpler, procedural bump and SSS.  The reflection_Lite_Multi can be unchecked.

The only thing I would try with this set up is to check the AO box for evaluation with IDL and recheck the bump value.  I don't know what scale your Poser is using, but 0.0025 seem very low to simulate 15%.