Well for one i have not heard of Crucial Dominators. I have heard of Crucial Ballistix and Corsair Dominators. That being said: If you were to have the Ballistix i would take the 1:1 ratio off and let the cpu FSB go and leave the FSB of the Ram at factory settings. If you were to have the Corsair Dominators that would be a different story. I might go ahead and just up the voltage on them bad boys upwards to 2.1 V to keep em stable and they will take a pretty nice Overclock to grow on.
Either decision you make just go ahead and do a memtest to make sure everything works well together in the long run. Just google memtest and burn the iso to a cd and let it run overnight.