guidance on cage type or design

Afternoon everyone in the community. I’m a newcomer to both here and the chastity scene… My spouse and I are fond of the cuckold/chastity lifestyle, but I suspect my current device isn’t quite right for me. My scrotum is tight and contracts noticeably… It doesn’t play well with my CB6000s because I tend to slip out. I’ve attempted smaller ring settings, but that leaves my balls turning purple within minutes, which is less than ideal… Does anyone have recommendations for a good adjustable cage? Mr Sussex.