GlobalFog overwrites Toony/BasicOutline outline shader -- outlines become white

Hello,

GlobalFog causes my outlines to turn white, even though fog is "behind" the outline (img: http://imgur.com/crPaYsy)

I found solutions to global fog transparency issues as follows, but none solve my issue:

--Setting the depth of the outline shader above the fog shader using {"Queue"="Background" or "Queue"="Overlay"}

--Adding "#pragma multi_compile_fog to the shader which was recommended by Unity5's shader upgrade manual

--Adding "@ImageEffectOpaque" to the OnRender function in GlobalFog.js

--ZWrite is on in the outline shader (Toony/BasicOutline")

Nothing works! It seems the fog from GlobalFog is always drawn over the outline, no matter how far away the outline is.

How can I force the fog to respect the z-distance of the outline?