CB Range discussion

Hello, I have a few questions regarding the cb6000.

I’ve tried several rings, and in my view, the third one (which is exactly medium) fits best. With this ring on at night, I still get normal erections, and my penis can rise up without causing pain. However, both my wife and I feel it isn’t quite right.

Next, I attempted a smaller ring, but that one was too tight; it hurt even under normal conditions and caused significant discomfort during an erection.

Is this a common issue for beginners? Do you experience something similar? Any advice would be appreciated. Thanks