Chastity Newbie Needs Help Keeping Device From Falling Off

Title says it all of course. I figured after reading a bunch and looking at prices a CB (authentic not a Chinese knock off from amazon) and well ever since I got a CB cage its been nothing but problems and not the kind of problems we enjoy. First Attempt: CB Curve: I followed the instructions on the CB-X website which said measure length and buy the next size up. Next size up for me was a curve as I’m between 3.5 and 4in soft as well as pretty thick. I’m also a grower going up to just barely shy of a solid 7. Curve seemed ideal for me. Well when I got in the mail the very first thing I discovered was that the moment I stand up the cage pretty much tries to fall off but can’t completely and I found with minimal effort I could easily slip my cock out of the cage (balls not so much still needed to unlock it for that). Okay I’m using too large of a ring, I did order the larger rings after all So I go down to the absolute smallest ring I can fit around my balls and shaft I seriously tried every single one of them going up in size until I was able to squeeze everything in there and when I say squeeze I really mean it SQUEEZE it in there. I set it up with the smallest spacer and well guess what SAME BLOODY PROBLEM. The Curve started to slide off. I got frustrated and gave up for a couple of weeks throwing it back in the box and tossing it into a junk cabinet. Second Attempt: CB 3000: Time passed and the frustration that the curve was money down the drain since I can’t return it due to the nature of the item as well as I still I really really really wanted to be locked up so bad I couldn’t stand it lead me to read a bunch of chastity websites and they all said measure your cock and buy the next size down usually 1/4 inch smaller than your length and this made perfect sense with the spacers and everything and any minor slipping of the cage down the shaft a smaller cage seemed to be the obvious solution to my woes. I see that the CB-X website sells cages only without the rings so I grab a CB3000. I put it on and it seems perfect the first day. I even slept in it though in the morning it had done the same thing, it slipped down my shaft trying to fall off, and I could still easily pull out of it, also the massively thick rings of the CB were digging into one of my testicles and causing them to swell so I had to take it off. I tried a larger ring still sticking with the smallest spacer and the whole thing pretty much just wanted to keep falling off. Never falling all the way off but enough to where instead of filling out my cage 95-100% I was filling out maybe 25% of the thing. After several days in a row of wearing the cage with various sized rings and spacers I reached this point where I basically said FUCK THIS. I offered to give it to my girlfriend and be her keyholder instead (shes MtF and still pre-op) but she declined I pretty much feel like taking the thing out back and shooting it because it keeps falling off my cock and making me feel so very very angry that I just flushed around $200 down the toilet between two different cages and I can’t return them. I honestly feel like just smashing the thing to pieces with a hammer or taking it out back and shooting it (literally) because its 100% useless to me. I’m scared to spend anymore money in chastity cage models because these two have left a sour taste in my mouth, I paid for everything I desired and got 110% disappointment, yet I still want that perfect cage, one that doesn’t fall off, one that will stay put when its locked. I don’t know what to do. I don’t want a full belt because of the nature of my work I need to be able to stand up and pee (only option is do it in the bushes or use the porta-loo and porta-loos are so beyond disgusting that I would rather just go in my pants because at least then I know who’s mess I’m sitting in and where the person it came out of has been) I’m just at a point where I feel like chastity is a desire I can’t have and I’m kinda afraid to buy another model cage because I’m afraid I’ll have the exact same problem. Please if there is anything you guys know that can make it where my cages will quit falling off and keep me from pulling out I need to know about it otherwise I don’t know if I’ll ever get to have a cage that I fill out, and can pee in without sitting.