Inner Edge Zones; Any GURU hints at closing?

[Aurasphere]

Im in the position now of really needing to lean on inner edge zones for many things

As complex walls have grown in use etc, I am now finding getting a proper close is in some case near on impossible. I am even using zone boundary lines to try and close. There are no slightly non orthogonal walls etc although there is now way to get a graphic override to highlight a slightly angled wall ie to audit...

So Im asking how others do it so that esp property reporting is reliable. 

eg

I am simply extracting the skirting quantity from zones via property object using GDL parameters which is know has worked quite well for a loooong time. 

These basic rooms are all good...

Produces correct output

This is reporting correctly but the hall zone which encompasses a number of diff wall types is...arg!!!

I have had to set to polygon because of this but of course reports wrong wall perim values

Not sure why zones arent part of modelling...they are intrinsic for data extraction

Operating system used: Windows