My suggestion: try Land Detail on 'Medium', Forest on 'Low', Texture quality on 'High' or 'Medium' (this was one of the big killers - 'Original' is as it was before optimising), and Land Shading on 'Medium'.
I run the settings like this, and it runs well and looks good.
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I'd rather be flying ...
Gigabyte 990FXA-UD5 | AMD FX-8350 | MSI HD7970 TFOC-BE | 8GB Corsair DDR-III 1866 | Win8.1 Pro 64-bit
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