You might be better off dropping the timings and keeping the voltage @ 1.5v see if you can drop them down to around
9-10-9-27, otherwise its just like overclocking any other component you'd have to bump up your timings probably around 11-11-11-30 then set target clockspeed and voltage. It will be harder to stabilize your cpu at higher frequencies though so you might just want to set it to its xmp settings and leave it alone.