Chastity device discussions and reviews discussion

My slave has massive testicles with very little skin between the pubic bone and the scrotum. For example, I can’t gather enough skin to push his balls down into the sack for twisting. He’s struggling with his CB 6000 because the ring pinches too much; he isn’t shaped like a funnel but more like a plastic bag. I’m thinking about ball stretching to create more skin between the pubic bone and the sac. Has anyone else had this issue, making it nearly impossible to keep their chastity device in due to insufficient skin? Is there an alternative to the CB6000? As I mentioned, the problem isn’t with the cage itself. We’ve tried the biggest ring available, but he still slips out.