Switching from 4 x 1gb to 2 x 2gb Ram--Nick?

Nick,
I am swapping out my 4 x 1gb Dominator RAM for 2 x 2gb as you suggested. I am clocked now at 3.6ghz on the q6600. My Ram timings are 666 18 rather than the 555 15 they started at. Should I go back to the factory timings with 2 sticks rather than the 4? Should I keep my voltage the same since my OC is stable at 3.6?
Also, I have two black slots and two blue slots for RAM on the 780i MB. Do I use one of each or stay with blue-blue or black-black?
I am swapping out my 4 x 1gb Dominator RAM for 2 x 2gb as you suggested. I am clocked now at 3.6ghz on the q6600. My Ram timings are 666 18 rather than the 555 15 they started at. Should I go back to the factory timings with 2 sticks rather than the 4? Should I keep my voltage the same since my OC is stable at 3.6?
Also, I have two black slots and two blue slots for RAM on the 780i MB. Do I use one of each or stay with blue-blue or black-black?