The HSV2 node is incorrect for Cycles, although you might get the same desired effect. I don't mix shader nodes designated for different render engines because if there is a slight variability in the nodes, it will impact the render.

AO always darkens the texture; it's a matter of controlling the intensity.  I think your Subsurface scaling value is set too high.  Given that the Poser models are proportionally sized on a smaller scale, the Subsurface scale, or the Subsurface Radius, should be adjusted accordingly.