Hello chastity Reddit!

I am a bona fide fledgling in the wide world of chastity, but my Mistress and I have been interested in locking me up for quite a while now. I did my due diligence by lurking in this fine subreddit, taking measurements of myself, reading device reviews, and generally becoming informed on the tricky task of finding the proper fit.

I waffled for quite a while on what device I wanted to try as a starter and was quite charmed by the Holy Trainer V2 with its elegant lock design. My only fear was that the tube choices seemed quite small and my instincts told me it wouldn't fit. However, after watching a video of a guy who appeared to be about my flaccid size slide it on with ease, I took the plunge...aaaaaannnnddd I should have trusted my instincts and not my ability to judge the size of another guy's dick as compared to mine in a video.

My Mistress and I excitedly break it out of the package and the first words out of her mouth were, "There is no way in hell this is fitting on you." Lo and behold, no amount of lube was going to be able to get my cock into the damn thing. It was just too narrow. If both my cock and the tube were really, really well lubed I could force (major emphasis on force) the tip of my glans to almost reach the end of the tube with tons of "spillage" at the entrance, and the instant said force was taken away it would retreat back to about halfway into the tube.

I guess this is my super wordy way of saying that the device I got was too narrow (and probably too short, too), and I'm seeking the wisdom of your collective experience to find out if there is a device for a guy with a bit more girth. I know custom devices are an option (I would eventually like to get one from Maturemetal), but I was hoping to get in crucial learning experience with a cheaper mass market device before I go with a difficult to modify custom one.

The problem is that I really can't find a mass market device that offers much more girth. The largest diameter I've found is on the CB Curve but that's only about .13 inches larger than the HT and I fear the 3 3/4 inch length might be too long (my underside measurements are between 3 and 3.5 inches).

So, is there a relatively cheap device out there for the girthier guy seeking chastity play? Should I just go for the CB Curve (or a knockoff) because I am underestimating the room .13 inches of diameter makes because mutliplying by pi and math and stuff? Any wisdom from you ladies and gentlemen experienced with male chastity will be greatly appreciated!

Apologies for the lengthy post, but hopefully I will be able to join your ranks soon!

edit: Spelling and missed words and clarification and stuff.