Chastity and orgasm denial discussion

Hello everyone, My wife and I have been experimenting with short-term chastity, intermittently. We began using a silicone model but weren’t fond of it, so we switched to the CB6000. That one worked well for short periods but always felt too tight, which led us to try a steel version. However, that didn’t suit us either, and we’ve returned to the CB6000. I’m currently on day four wearing mine indoors, though I remove it during work hours. We plan to test sleeping with it on next. The primary problem I faced was a burning sensation; after researching here, I ensured no skin folds were trapped underneath, which helped. I also learned that lubricant is beneficial and have been using it. Now, the device tends to slide upward. I can fit into the second-smallest ring size, but while it doesn’t slide up as much, I find it painful; I haven’t tested this with lube yet. Should I stick with my current ring tonight or switch to the next smaller one? P.S., we hope to keep it on overnight if comfortable and continue from there for the following four days.