Chastity and orgasm denial discussion

My spouse and I are trying out round-the-clock wear year-round, aiming for a higher-end piece of equipment. However, one testicle keeps sliding behind the cock ring on my current device, which needs daily tweaking. This makes it tough to feel truly dedicated to permanent chastity for both parties. Aside from that issue, the fit is quite comfortable. I want to resolve this before committing fully. My index finger slides between the scrotum and the ring. The gap measures half an inch. The ring size is 1.875 inches. Is the cock ring oversized? Is the gap too wide? I’d value feedback from seasoned members.