I think more than one of us is betting you could bump up the VCORE to 1.37V to see how far it would go with that. That setting is so close to the recommended max that you should be "worry-free."
My own views are that you should try the Corsairs in a 1-to-1 ratio at the stock latencies for that sort of over-clock attempt, and then see how you might tighten tCL, tRCD. If you can get either reduced to 3 or just 4, the tRP can come down to 4 and I'm guessing tRAS would work at <= 8. Unfortunately, I've heard that the INtel chipset / BIOS won't allow for manual tightening of the bank-cycle-time, but there may be some sort of setting in there that does it for you.
There were a set of Corsair DDR2-800's that had default tCL/CAS = 3. I don't think it's important to exploit the full Mhz spec of your memory, if you can run slower Mhz and tighter timings.