The smallest cage on AliExpress (29 mm ring) is too large for me (my 6th)? I'm in despair

To knock it right out, yes, I'm buying them on AliExpress. I'm mentioning this because I'm scared you're going to humiliate me. Although I'm quite sure, my issue is unrelated to their quality. Now I'm going to give you a quick run down of my experience with chastity (skip to cage #6 for the main tragedy).

I got into orgasm denial / NoFap thanks to a game Virtual Succubus, but it was the Sissy University website that literally shoved my nose into an AliExpress link to buy a cage IRL (ironically, a Holy Trainer, which I would go on never to purchase). And so I did. I checked a review of various devices by Sissy Joyce on PornHub, and then actually saw a dolphin cage on AE. (I'm not a sissy btw, merely tolerant/open-minded.)

Cages #1 (dolphin; plastic) and #2 (fish head; plastic) I bought on the same day. They proved out to be too long (65 mm tubes), although I consider it money well spent as I could achieve a caged orgasm by simple friction with great effort.

Cage #3 (perforated design; plastic) is a cause of burning shame to me, as it's utterly useless, the rings are simply too large.

Cage #4 (openable ring; plastic) was effectively a real attempt on my part. A 38 mm long tube, a plastic device with a bar design for washing, AND with an openable/riveted ring - what could go wrong? First, I finally realised that cages #1 and #2 are not unique in that the smallest ring is unusable because the gap between the ring and the tube disappears. Whatever, the 43 mm ring will fit anyway, I thought. Inb4 the cage slid down. And here I encountered but didn't exactly realise a second point - cages #1 and #2 kept themselves up with the 48 mm ring because the tube continues backwards behind the ring (just like Holy Trainer). A part that this cage and all the metal devices are missing. (Even with this problem I managed to wear it it for 2 days and 1 night, and it felt like a decent chastity experience, absolutely zero stimulation. The soft protective film from one of the rings I would later use for cage #6.)

Cage #5 was my first metal cage, never intended to buy one but there was a huge summer sale (3 USD for a 20 USD metal cage, lol; although I actually bought this one for 7 USD). It slides down. The original 45 mm curved ring - slides. The other 40 mm circular ring I ordered doesn't fit the cage, but it slides anyway, so money double wasted.

And finally, I'm coming to the current issue - cage #6. I decided that the issue was the ring size. So I went out to search for the smallest ring physically possible. And I found it. The riveted/openable metal cages with rings down to 29 mm in height! Bar design, sold for 13 USD. It can't go wrong, right? Unless the ring is too small making my balls fall off, correct?

It's too large!? Or I don't get my anatomy. As some say, maybe the balls are too saggy with my being a grower? Either way, even this smallest of all cage rings I have seen in that store makes the cage slide down! How is it possible? And the joke is, the ring is so small, it takes me 30 freaking minutes to put it on. I kid you not. My will is like iron, and I repeated this ordeal 3 times, the cage slides less than the previous one, but it's still just not worth the torture.

What am I doing wrong? And is there any hope for me? I saw people mention holding strings, underpants, full-metal chastity belts. I understand that "ball-trap" devices are a meme for some people. But I was quite sure the 29 mm ring will hold onto my scrotum! With this in mind, how can even a 300 USD custom-made cock cage fit me?

And as I said previously, what makes the fish head cage hold its position much more reliably is the tube that continues behind the ring. It effectively covers more of the base of my penis. But such a design choice literally doesn't seem to exist among the metal cages? Aside from the weird full-metal Holy Trainer-esque knockoffs. Any idea why that is so?

Overall, it's quite disheartening. I'm not superstitious, but I feel doomed in the final calculation. There are things I can still potentially try out.

1) Holy Trainer V4 Nub/Mini - probably will be wearable, but it is a completely closed design, and I'm weary of the pliability of the bioresin material;
2) Vice - it is hugely advertised everywhere, costs a lot of rupees, has anti-pullout parts, but I don't get how it might not be useless for me after all of the above;
3) Mamba 3D printed cages - the tube design is the same, the smallest ring is 38 mm - these don't give me substantial hope.

Piercing is completely out of the question for me, but I honestly believe even that wouldn't amount to much, the cage would still slide down.

That said, I wouldn't want any folks reading this to be discouraged themselves, I actually got quite a few things out of the journey so far - 1) caged orgasms that come at great effort after at least 5 min of an immense leap of faith in my ability to cum (and that is an incredible contrast to trying not to cum too soon); 2) I even experienced my first ever milking while wearing cage #6, with the gentle backwards motions of a buttplug (it was microscopic, but still counts as a proof of concept). But I'd like to know there is a solution.

 

Thanks all for help, much appreciated (I read it, just without logging in, as I sometimes don't log in).

Just to clarify, the main difficulty in putting on the last cage lies in keeping the pins not to pinch the skin, while simultaneously not pinching it with the middle part of the cage which is simultaneously going inbetween the two parts of the ring. I.e., the openable ring is fine and dandy until the cage is so short, the skin bulges. I didn't feel anything abnormal when wearing it. And I chose the smallest ring because of a naïve hope it would make device grasp and hold.

By the way, I also used a "tissue method" (if it's the same as the other one I don't know), mainly to put the pressure on the skin equally and evenly. But I also did it without.

Yes, I did see such devices. But is there any specific advantage to a metal HT?

And on another note, why does Holy Trainer Nub seem so much more popular than Nano, if the size is comparable?