I don't know what to tell you, I know nothing about overclocking AMD systems. How do you know it's the Vcore that's holding you back? I would try raising other voltages like you said.
i know i saw that lol. how? like 2 on back and 2 on top and 3 in front. 1 in the psu. one on the cooler and 3 on the side. plus one on the video card and the last fan could be on a secound video card or a sound card or ram am i right
3 120MM fans on the front (1 you can't see)
2 120MM fans up top
2 fans on the 4870
1 120MM on the CPU heatsink
1 120MM behind the CPU heatsink
1 120MM behind the hard drive cages
2 80MM hard drive exhausts
1 PSU fan