Male Chastity Now discussion

I own the Contender model and am working toward long-term chastity. I’m struggling with one of my testicles slipping out from under the base ring. Has anyone dealt with this? Would widening the space between the cage and the base ring help? My cage fits tightly, while the base ring sits about 1.5 inches down on my shaft. It feels like I need to increase that gap so the base ring presses closer against my body. Then again, maybe my logic is off since engineering isn’t exactly my strong suit.