Chastity device discussions and reviews discussion

Hi everyone, I’m wearing a CB6000S right now and planning to pick up a Holy Trainer v2 soon. I need some advice on which ring size to go for because the rings are incredibly pricey, so I want to get it correct initially. With my CB6000S, I use the third ring, listed as 1 3/4 inches on their site, though my own measurement shows it at about 45x42 mm. It feels slightly oversized; when fully flaccid, I can fit two fingers underneath it. On the other hand, the 1 5/8 inch option is too tight for me. Based on forum discussions here, a 40mm ring seems appropriate for the HT, although some users find even that to be a touch large. Given that my current 45mm CB ring feels about 1 or 2 mm too big, would switching to the 36mm HT ring make more sense? Or might it end up being too small? I also used their string method for sizing, which suggested the 45mm ring, but from what I’ve seen elsewhere, that technique isn’t entirely reliable. Additionally, the length of my CB6000S feels correct. It gets filled most of the time without feeling cramped. Does this imply I should get the small HT version as well? Thanks ahead of time!