Steve, great job, as always.
I reproduced all 3 benchmarks with the 331.65 geforce driver at 1080p on my Gigabyte GeForce GTX 670 (2048MB). I don't know if it was due to the slightly lower resolution or performance gains from updating the driver, but I was able to consistently achieve from 18% to 21% higher frame rates than you did. In the last one (MSAA 8x, physx normal), I had 64 fps.
I know you don't have time to retest everything (specially if you're benchmarking Battlefield 4 and AC IV Black Flag) but perhaps you could try just one card and check it with the new drivers.
Suggestion: since you went through the trouble of checking physx also, perhaps you could show us some graphs with dedicated physx too. And also, test something I'm dying to know: is it true that if you dedicate one of your SLI cards to physx, you may get higher frame rate than when just SLIing them?