Dynamic Sections - Colour/Line Thickness Issues (V8i - Select Series 3)

Hi all,

We are having some difficulties in the presentation of our steelwork drawings taken as dynamic cuts from our 3D model. 

We have a requirement of seeing the hidden detail as a dashed line which I have done changing the 'Edge Settings' in the display styles and then changed the presentation of the view, see below; 

So far, so good!

The issue we are having is that the hidden detail is too prominent so I want to be able to 'grey' this out. I've looked at the various 'Edge Settings' in display styles but I can't see a way to separately control the colours of the solid and hidden lines.

Below is what the sections currently look like;

You can see that the hidden lines are as prominent as the solid lines.

Below is the type of output we're trying to achieve (this was taken from an old job which was done in AutoCAD, where the hidden detail has just been greyed out)

Does anyone know if/how I can achieve this?