Well, I have to say that there's a few variables in your config, that more or less defeat whatever FPS you gain by turning things like Color Grading and DOF down a notch. I think it's the vegetation area that's the culprit.
So with that said, I don't use it all in it's entirety, but the main thing for me is that I don't want custom shadows because I like them set on Very High, and whenever I run with custom variables, lots of frames are lost. I'm still trying to narrow it down. None the less; email me over a copy