Turn off these two things:
texture filtering - anisotropic mip filter optimisation
texture filtering - anisotropic sample optimisation
These optimisations are increasing performance but decreasing quality.
I am playing on gf 6600 gt (worse than yours) with these two disabled.
I am not sure about this one:
sli performance mode - single GPU
cause i dont have sli, but if you have two graphic cards in sli mode shouldnt this setting be changed to "multi GPU" or something?
Are you using 163.xx series drivers? Cause i was using them and image quality in sh3 was very bad even with antialiasing and anizotropic filtering enabled (and i had random crashes to desktop) so i decided to go back to old 91.47 (from september or october 2006) and - they are much much better.
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- improved with GWX and...too many to list them here 
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