assistance with finding the right fitting chastity gadget

Greetings everyone, I’ve been experimenting with chastity devices and haven’t quite found one that fits well yet. I am tall and lean, and just ordered a Holy Trainer with the largest ring (50mm), but it was really difficult to get on…and even after putting it in place, it started rubbing and hurting me. The tube was also somewhat tricky to insert, though I managed it; however, at night I experienced severe pain and pulling sensations in my scrotum. I’ve tried the CB 6000 before too, but that one cracked along its seam, and I didn’t like how uncomfortable it felt while sleeping…especially since I usually sleep on my stomach. I’m seeking advice and some guidance…and figured this forum was a good spot to ask. Thank you, j