That's amazing. My first year, I was plucking by hand and could not get to the CX fast enough. The processing was spread out over many weeks. My largest was 13.7 lbs dressed. I think the bird was 12.5 weeks at that point. I had several over twelve pounds. Every bit as tender and juicy as the 8lb broilers, and actually easier to process.
Birds were free range and very active. Unlimited food except weeks three and four, where they were fed for 30 minutes twice per day. Did not lose any to heart attacks or leg issues.
It was hilarious and amazing to come out of the barn and see 30 ten-pound birds come tearing at me from every corner of the yard. My daughter called them "turtle cannons". And yes, some of those ten-pound birds were flying.