Ok, I don't have the time here at work to try this right now, but here starts my trial and error phase for you:
1.Select the camera you are rendering from.
In the Attribute Editor, expand Output Settings
Turn on Depth, then set the Depth Type to Furthest Visible Depth. This prevents "fringing" around geometry.
Lemme know if this helps at all before we continue
Israel "Izzy" Long
Motion and Title Design for Broadcast-Film-DS
izzylong.com