Chastity device discussions and reviews discussion

I recently purchased the Spiral CD from Tickleberry. It comes in three ring sizes: 40, 45, and 50mm.

Mine has a 50mm ring. Once I’ve fully shrunk down, I can pull my penis out because the current size combined with my low-hanging balls gives me enough room between my body and the ring.

I feel that if I switch to a smaller, tighter ring, it will keep the ring from sliding too far away from my body. This would prevent me from being able to easily remove my penis from the cage when needed.

When completely flaccid, my measurement is around 45mm. However, once I grow up a bit, 50mm seems more appropriate. At that point, having the CD becomes somewhat pointless because I can just take myself out of it while flaccid anyway.

So here’s my question: Will 45mm make a noticeable difference and provide enough security to keep me from slipping out? Or do I need to go down to 40mm for a secure fit?

I don’t want the discomfort of blue balls, but this current ring size feels pretty useless.