Just to compare notes here are my initial Reality-LuxRender settings for the new DAZ Stephany/Michelle skin:

Diffuse Colour: 242-247-255
Specular Colour: 83-87-89
Glossiness Strength: 6524
Top Coat Colour: 170-134-120
Top Coat Thickness: 0.10
Surface Fuzz: on
Bump Strength: 12%
Bump Negative: -0.010
Bump Positive: +0.010

Nail Glossiness: 8000 Surface Fuzz: off
Lip Glossiness: 8000 Surface Fuzz: on
Lip Bump Strength: 18%

Test renders: DAZ Stephany (Riley shape + Michelle textures).

Image Based Lighting + 1 meshlight.

The only modification I did was to 'deflate' those balloony Riley lips a bit.

 

 

Larger versions can be found in my gallery here at rendo.

If I find better settings I'll post them of course, but these seem to work quite nicely.

Cheers!