PLEASE tell me you aren't doing this with some CRTs (1600x1200?), because that's not only hideous, it's wrong, unethical, and illegal in most civilized nations.
Fair warning, my setup is ATI, so what works for me might not work for you.
My conf.ini relevant sections:
[window]
width=6052
height=1080
ColourBits=32
DepthBits=24
StencilBits=8
ChangeScreenRes=1
FullScreen=1
DrawIfNotFocused=1
EnableResize=1
EnableClose=1
SaveAspect=0
Use3Renders=0
[GLPROVIDER]
GL=Opengl32.dll
[GLPROVIDERS]
Open GL=Opengl32.dll
DirectX=dx8wrap.dll
Note my resolution is odd because of ATI's bezel compensation.
Here is my OpenGL section. WARNING!!! You have Nvidia, so several of these will be different for you, you'll have to google for correct ones.
[Render_OpenGL]
TexQual=3
TexMipFilter=3
TexCompress=0
TexFlags.UseDither=0
TexFlags.UseAlpha=0
TexFlags.UseIndex=0
TexFlags.PolygonStipple=0
TexFlags.UseClampedSprites=0
TexFlags.DrawLandByTriangles=0
TexFlags.UseVertexArrays=1
TexFlags.DisableAPIExtensions=0
TexFlags.ARBMultitextureExt=1
TexFlags.TexEnvCombineExt=1
TexFlags.SecondaryColorExt=1
TexFlags.VertexArrayExt=1
TexFlags.ClipHintExt=0
TexFlags.UsePaletteExt=0
TexFlags.TexAnisotropicExt=1
TexFlags.TexCompressARBExt=0
TexFlags.TexEnvCombine4NV=0
TexFlags.TexEnvCombineDot3=1
TexFlags.DepthClampNV=0
TexFlags.SeparateSpecular=1
TexFlags.TextureShaderNV=0
HardwareShaders=1
Shadows=2
Specular=2
SpecularLight=2
DiffuseLight=2
DynamicalLights=1
MeshDetail=2
VisibilityDistance=3
Sky=2
Forest=3
LandShading=3
LandDetails=2
LandGeom=3
TexLarge=1
TexLandQual=3
TexLandLarge=1
VideoSetupId=17
Water=2
Effects=2
ForceShaders1x=0
PolygonOffsetFactor=-0.15
PolygonOffsetUnits=-3.0
I have found that running with Crossfire on does NOT work, the game will crash at 100%. You only have one card, so SLI shouldn't be an issue. I don't remember which monitor is the primary, but I don't recall it mattering at all.
If you are running bone stock 4.10.1 or 4.11, you'll need to run San's FOV changer. Find it here:
http://il2fovchanger.byethost7.com/ It comes with very simple instructions.
If you run mods like UP3 or DBW, then this can be done without San's applet. Check the Special Aircraft Service forums for two mods, the default FOV changer, and FOVmod which allows for much greater range of settings.