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At high overclocks its very common(required) to use a slightly higher cpu voltage. Id also look at your ram speed. You may want to consider dialing down your ram as low as your motherboard will allow until you find the CPU speed your looking for and then tweak the memory. I know it takes longer but I feel like you get a more fair evaluation of what the CPU is capable of when you do it this way.
Edit. to answer your last question its a bit of both, push vcore until you reach stability and then continue with overclocking until you reach your goal/cpus limit. If you havnt met your goal but the CPU wont cooperate give it more vcore(to your personal limit) and see if you can get more out of it.
righto, ssjwizard the slowest my mb will alow for memory is 6 and thats what it was set to and i agree that would seem to let the CPU do more work, im sure it might im no expert lol, so i just increase my Vtt by 0.01 till im stable up the BCLK till its unstable, repeat process