Shaft swelling where the ring makes contact

Hello, I wouldn’t call myself a complete beginner, but I don’t get locked up very frequently - though that might shift. Recently, whenever I’ve been in the cage, I notice some noticeable swelling at the base of my shaft, right where it meets my body. It looks and feels just like the ring from the CB-6000S model. The puffiness disappears after roughly an hour once the device is off, but it’s a bit unsettling. I’ve tweaked things a few times to figure out what’s going on. I can’t choose a larger ring because then my cage might slip off while showering or sleeping. Conversely, I definitely need something tighter than 1.75 inches, so the ring size is basically locked in. It feels good at this dimension, but I absolutely despise the hard edge style. In my view, the biggest downside of CB rings is that they use a hard edge rather than a ‘Torus’ shape like a doughnut. A design similar to my comfort-fit wedding band would likely help significantly (quite fitting!). I currently use the smallest gap setting. Has anyone else experienced this? What are some solutions? Could it be related to lube usage? I’m quite seriously looking at buying an affordable metal replica because I can see that their rings have a Torus shape, and I believe that geometry would solve my issue. Any thoughts?