@bmf - that's a very nice overclock on the E6750, especially at 1.3500v on the vcore. Important for you to know that CPU's and ram modules all have variances and that as you begin to reach the outer limits of a particular overclock, cutting and pasting someone else's bios values is going to, more often than not, be problematic. Mrfatboy's suggestions revolved around a 3.2GHz overclock - FSB at 400, multiplier at x8) which experience has taught him is a cinch on the E6750, almost always on stock vcore settings. Jumping to 3.4GHz by moving the FSB to 435, while leaving the vcore alone is probably not typical...
What I don't think you've been asked to verify is the voltage applied by your motherboard/bios to your Dram after you've applied the +0.2v. You can find that value in your bios, under the PC Health section. That value, unfortunately, is not "fixed" in any way on this board/bios - I suspect it has to do with the bios attempting to read the ram's SPD/JEDEC and applying certain default voltages based on what the bios finds loaded. Meaning, while conventional wisdom, and Gigabyte's own manual, states that default voltage to VDimm is 1.8v (and thus +0.2v added would yield a value of 2.0v) that has not proven to be the case.
My limited experience tells me that your Corsair mem is going to want to see voltage at 2.1v before allowing 4-4-4-12 timings. At the same time, your Ram (via the motherboard) is going to "reject" voltages much over 2.1v, which leads to the board resetting O/C values at post. This is why you'll see in this thread (and others here at Anandtech) long discussions about this bios version or that, because different versions seem to interact differently with each individual's hardware, with a direct effect on VDimm voltage (and subsequent overclock of their particular Ram.) Peruse the signatures of various members that regularly post to this thread and you'll notice many different bios versions - arrived at by trial and error - and used for different reasons. For example, I use F2, mrfatboy uses F4, honolululu uses F5...perhaps you get the point. These folks aren't using these versions because because they haven't gotten around to updating them. Instead, they've reverted back to these versions for specific reasons relative to their specific hardware and personal goals and requirements.
Regards,