Chastity and orgasm denial discussion

Hi all, I’m looking for some guidance on how well cockrings fit with ball trap style chastity devices. If I have to name them, they were previously known as A rings when people talked about CB-X000 sets. Right now, I am testing several different rings to determine which one suits my body best. On hand are oval options from Mature Metal, along with the solid, round A rings that come in a set for the CB-2000. My anatomy is somewhat unique, though I suspect many men can identify with it: my testicles sit relatively high and tight (though not extremely so), and my flaccid penis measures around 1 inch across. The tricky spot when selecting the right cockring is that area just above where the shaft connects to the pelvis. It feels like there’s a little pocket or cavity beneath the skin, making this section narrower than the rest of my anatomy. To explain it better: if I encircle my penis and testicles near their base with my thumb and index finger, the circumference is noticeably smaller compared to taking that same measurement just slightly lower down (about 10mm away). The real question is whether I should choose an A ring that sits snugly against the body at its narrowest point, or one that rests a bit further down where it can be looser? Since the device will trap my testicles regardless, does it matter if the ring holds everything tight to the pelvis, and would doing so improve things? Additionally, I notice that rings positioned closer to the pelvis tend to restrict blood flow slightly during erections, meaning they don’t release pressure as easily once engorged. This could be problematic in a chastity setup where there might not be sufficient internal space for full erection initially. Has anyone else dealt with this issue? What choice did you make, and how has it worked for you? Thanks so much for your input!:D( P.S. I am really enjoying the oval rings; they feel very comfortable on me!