I most definitely agree about dampening the speakers but that seems like a hell of a lot of clay on the baskets!!!
Working with the clay is like being a kid again, once you start you can't stop.
I noticed the price of the Energy Connoisseur CF-50 speakers are $151.99 each at Newegg.
Even though No Rez is an excellent damping product there is a cheaper alternative since the CF-50 are, after all, a budget speaker.
I have used both No Rez and a DIY method on different speaker projects and you may like the DIY cost savings. No Rez is basically a heavy hard rubber sheet with open cell foam attached to an adhesive backing. The DIY damping is a lot more work and messy but does come with a substantial cost savings.
The DIY method uses 2 layers of self stick vinyl floor tile from Home Depot, 1" open cell foam from a neighborhood fabric store, and 2 cans of 3M Hi-Strength 90 spray adhesive. My first test with the floor tile was hit and miss, some tiles stuck and some pieces fell off the next day, the addition of the 3M adhesive on both sides of the tile worked like a champ and gets stronger with age. I used the 3M adhesive to attach the 1" foam too.
5 - 24" x 27" sheets of No Rez costs $224.75 + shipping.
5 - 20" x 30" sheets open cell foam, self stick vinyl tile, 3M adhesive cost $84
The cost difference between the No Rez and the DIY method was $140.75.
You should do the CC-10 center speaker first (add another sheet of No Rez to the order). Dialog clarity will be enhanced.