From my experience you must rotate the tires or they will cup and get really noisy. I had a passenger once ask if I was running snow tires! My tire dealer rotates for free every 5k miles so that's what I do now. Problem solved.
CC2 are very good tires, but they're not low RR. I'm seeing a 10% increase in fuel consumption since mounting them. Great in every other respect, especially in winter, but I'm not seeing 50 mpg this year. European tires are a different design.