Im using everest. I will try to get em up there, i wasnt using 2.75 v so i will try thatI usually start with the first and work my way up. So if my timings were 5-5-5-15, I'd try 4-5-5-15 and if that worked try 3-5-5-15. If that fails I'll move on to the next and repeat the process.
You could also do a little testing with Everest or a different memory benchmark program to determine which settings work the best.