Steve has a LOT more experience than I do with PV (I've only ever done a few kilts in PV), so he's the best one to give advice for how to work with the material.

The only thing I'm going to add is that how you split the measurements does govern how much shaping you have to do in the apron and underapron edges. TAoK suggests splits that put more in the apron at the waist and more in the pleats at the hips, which serves to reduce the shaping needed on the edge of the apron and underapron and puts more shaping into the pleat taper. Because pleats taper along a straight line, that's a place where you can do shaping of the kilt in PV without having to do it along a curve. So, my analysis is that splitting evenly would actually make matters worse, not better.