All this work to go from 2.75Ghz to 2.8Ghz? A small 1% difference in speed? Id keep my memory at the faster speeds and my voltages slightly above stock and call it what it is. Not work risking it for such a trivial difference IMO. I love overclocking but just like drinking.. you gotta know when enough is enough
You probably just hit your limit. Any good overclocker knows... you reach the point where its unstable and your system is at its max and take it down just slightly.