Novices and newbies discussion

Hi everyone, I’m fairly new to the world of chastity and hope to gradually build up to wearing one for a full week. However, I have some safety concerns about my fresh CB-6000s that I want to address—specifically ensuring the fit is correct and, above all, safe! Out of the five U-Rings included in the kit, I’ve decided that either the largest or the second-largest ring will likely work best for me. Technically, I could use the middle-sized one, but it feels a bit too snug on my end. (I don’t usually hang very low, and while my testicles aren’t huge, their thickness is reasonable.) Conversely, my penis is of average size or slightly smaller than that, shrinking quite a bit when flaccid. Because of this, I’m leaning toward one of the two smallest spacers (from the set of four). With the largest ring paired with the largest spacer, there’s actually enough room for my testicles to slip out from under it. So, I believe combining the largest ring with the smallest spacer offers the optimal fit (though I’ve also thought about pairing the second-largest ring with the second-smallest one). I feel very comfortable in this configuration and sense that my testicles have plenty of room to move. However, I have noticed dark purplish veins becoming visible on the surface when they are constricted at the base like this, especially once the penis sheath is secured. (The only time these don’t show up is with both the largest ring AND the biggest spacer, but in that setup, if my balls swell or constrict even slightly, I risk slipping out). Provided there’s no pain involved, do you consider this normal for someone in chastity? It feels alright; I’ve worn it for short stretches without issue, and everything looks fine immediately after taking it off. I just wanted to confirm that this is a typical experience. I would expect it to hurt if the pressure were excessive or too much. 2.) Is it common, especially among smaller fellows, to be able to “fish out” your flaccid penis when you want to? It doesn’t happen naturally on its own, but the cage structure seems forgiving enough that a determined effort can get past it. I’ve thought about tightening things up further to prevent this pulling-out possibility entirely, though doing so would complicate my answer to question 1 above. So, is it “right” to keep the fit as loose and flexible as possible while still preventing accidental slips (even if you could force your way out manually)? Thanks!