Load all your CM launchers with Chaff (you should do this anyway when playing as the FFG, the vast majority of high threat missiles are radar guided) and when you know you are being attacked, you should fire off three of the packets on both sides and turn away from the incoming missiles and back around behind the clouds of chaff, with your CIWS on Full Auto (Auto is generally recommended) firing SM-2's using both your Fire Control Radars.
That's it.
Cheers,
David
PS Oh, and when you come about on the other side of your first chaff cloud, you should fire off the other six packets when you have stablished a course 120-150 degrees off the incoming missiles, so you can engage with your SM-2 and CIWS effectively, and you are clearing the course of your chaff clouds relative to the missiles' path.