Help!! Muddy/Shadowy Edges on White Model in Mental Ray

[stephendiebold]

So I am having some difficulty with getting clean edges to render in my scene and am looking for guidance in how to solve it easily.

 

I am using a skylight and some target spotlights to light a mostly white model with a mental ray arch & design semi glossy material. And for some reason, when I render the edges are showing some nasty shadows/dark spots along the edges. Why is this? I have found that by raising the final gather precision to "Very High", it eliminates these shadows, but the render then takes forever. And at work, I can't afford this time. I am including a screenshot of some of my render settings.

 

 

 

 

Edited July 29, 2015 by stephendiebold