After an internet search I found out that I shouldn't have listened to the ZBrush recommendations ( I pressed get scale and set the Mid value back to 0....)
Once I figured that one out it was pretty much over and done with and the render did the rest.
I did find it strange that since I generated a 32 bit displacement map the values for alpha gain and offset didn't work anymore at 2.2 and -1.1 , I even went below 1 for the gain ( ???), ah well whatever works right?.

I also have been fiddling with SSS in Renderman, it's just a blinn with SSS properties( is something you can do with renderman) and I only chucked the colormap in the diffuse and tweaked the settings of the SSS by color( have no idea what the values do since if I turn all of them off except one, the SSS doesn't work anymore...grrr...).

I have put the settings in the image as well

C&C en tips are most welcome