Need Help setting timing on Corsair XMS modules

[kopykat]

Hi all,
The SPD on my ram is 3-3-3-8. According to Corsair my ram can run stable at 2-3-3-6 @ 2.75v . I tried setting my timings and the best I can reach so far is 3-3-3-5 @ 2.8v . Can someone tell me if im doing something wrong, what am i missing?
Thanks.

 

[Crashman]

Try 2.9v and 2-3-3-6.