Novices and newbies discussion

Alright, a question for everyone. Just to set the scene: my wife and I have been experimenting with orgasm denial (for me, obviously) for quite some time now, so it’s not new territory for us when I can’t reach climax. I’m definitely more of a sub in this dynamic, but she isn’t naturally domineering, so I usually steer our kinky activities. A few years back, I convinced her to lock me up; she did it for a day or two, but the arrangement didn’t stick because she wasn’t entirely comfortable with it and found no sexual appeal in it herself. Fortunately, that experience left us with a CB6000. Recently, for reasons unrelated to this discussion, I asked her to put the lock back on me again. This time around, it was less about fulfilling a fantasy and more about practical frustrations—specifically my habit of masturbating and my desire to feel connected as her sub while other life factors had kept our kinky routine paused for several months (with no end in sight). She agreed. After a couple of days, we chatted, and I mentioned how surprised I was by the positive mental effect it had on me; being locked helped me be more supportive of her, which she really needed at that moment. Impressed with my mindset shift, she decided to keep the lock for several additional days. In total, I spent about five days in chastity. Sorry for all the context! Here is what I want to ask: I am definitely a grower rather than a shower, so the CB6000 might be too large for me (which is why I already ordered a smaller 6000s). However, I’m experiencing some discomfort now and worry about potential damage. While locked up, I would occasionally get an erection that felt uncomfortable. One or two times, it went beyond just uncomfortable; the issue was my penis trying to swell inside the cage because the head wasn’t resting at the end due to sizing issues. When my shaft throbbed during these erections, it hurt quite a bit. The pain subsided once the erection passed, so I didn’t think much of it then. My balls have always been fine. I took the lock off last night for a while (went swimming) and noticed that getting hard was slightly difficult. Even when an erection did occur outside the cage, my penis still hurt a little, particularly at the head—the same spot that bothered me while locked up. I decided to skip re-locking myself tonight and stayed out all night. This morning in the shower, I forced another erection; it definitely hurt less than before, but there was still some discomfort. Is this normal? Or is my cage just poorly fitted for me? I’m fairly confident things will return to normal within a few days (fingers crossed!). Does recovery take time naturally, or do people often struggle with erections after being locked up for many days? Thanks!