there's no way you should have to set that ddr ram at 4-4-4-12 timings.
you shouldnt have to up the vcore much yet.
what stability tests are you using?
you can use different ones to narrow the problem down a little.
i can give examples if you need them.
i think typically it will be the mobo limiting the overclock, not the cpu.
can you adjust the htt multiplier? or bus speed, maybe on this mobo? if so, put it down a notch or two.
if you have one (i am not too familiar with your mobo or cpu) and it is set to 5, you are probably overclocking your ht bus too much 240 x 5 = 1200mhz. the max bus speed on that mobo i believe is 1000mhz. perhaps you need to lower the multiplier associated with the bus (whatever it is called in your case) so that the max bus speed is at or below 1000mhz.
in any event...if i am on the right page, having that bus too high will keep you from raising clock speed very much.
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