ok... i managed to use your technique to get 280 stable according to your standards. They even proceeded to pass memtest86 test #5 several runs at bootup.
However, they do not appear to be "game stable." since setting them at that speed cuased a reboot 1 hour into BF2. My temps were not over 50C, so the reboot appears RAM related, and does not occur @ 270. They also failed to pass 32M (two instances) AND they failed SP2004 memory stressing.
So, the bottom line is that I'm not sure of the validity of just using windows Memtest to claim stability at any given speed.
see pic:

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