New Member's Chastity Device Question

Hello, I’m fairly new to chastity devices, but we previously owned a CB series model (specifically the CB6000) and I ran into some trouble with it. The main issue is that I tend to grow rather than shrink; when flaccid, my length sits around 2 or 3 inches. Since my testicles are fairly substantial, I couldn’t fit smaller rings on the CB device, even though I was already using the smallest spacers available. After just one night in it, I managed to slip out of the tube, leaving the device pulling tightly against my balls—a sensation that must be quite uncomfortable. I’d love to know if anyone else has dealt with similar problems and what alternative devices you would suggest for me. I don’t have any piercings, so please no piercing-specific options, and I prefer not to use anything that penetrates. Thanks in advance!