cb-6000 fit query

When I first put on my lock, it seems to fit quite well, however after a few days it starts to slide down a bit more to the point where my head is stuck near the air vents. This becomes frustrating and problematic for bathroom breaks, and even more uncomfortable when I get hard. Does anyone have experience with this? Is it normal? Ways to avoid it? Or is it a fitting problem. I’m pretty sure if I go smaller on the ring size I’ll be cutting off circulation. Any thoughts are appreciated.

That's the experimentation of a new device. See what you can tolerate or get used to. I've found that a smaller ring is very helpful during the day, but very difficult with night erections. So, I switch out sometimes. Surprisingly, the smaller ring helped a lot with irritation I had at the two o'clock position, guess it just held the device in a better place. Don't count out that a smaller ring may help a lot!