The problem with the eyebrows on the P4 figures is that the designers were hell-bent on them being projections from the skull, and to circumvent the organic smoothing that Poser applies to geometries, they added a butt-load of hidden polys inside the face where the brow meets the skull. It's a royal pain in the posterior to drag all of them out and then reorganize all these extra vertices to a smooth surface -- which results in vertical distortion of the brow section of the texmap. You'd have to edit the texmap to make the brows taller for reverse compensation. I think the only solution would be to add another mostly transparent brow layer prop to the head with .CR2 hacks to ensure the brow layer obeys the brow dials. Euugh.