Chastity and orgasm denial discussion

Hello everyone, MissMira has put me in a cb 6000 and the difference compared to my curve is amazing. It feels much tighter and looks great, but it raises a few questions that I hope you can answer. 1. The airholes are quite sparse on this model; should I worry about them or not? Could they potentially harm my skin? 2. The curve fit snugly around my shaft, while the cb 6000 is even tighter. Is it possible for it to be too tight? It doesn’t feel uncomfortable at all, just restrictive. 3. I could manage an erection in the curve (or nearly so), but with the cb 6000 it feels like erections are impossible. Do others share this sensation?