Please excuse this, possibly very needy request for advice. I've been trying quite a few times to get into chastity and always end up coming up against a brick wall when doing so, and now I've stumbled across this awesome forum and had a read at some posts hope someone would be kind enough to point me in the right direction.
Just some 'facts' incase they are important, I'm about 7.5 inches errect and about 4.5-5 non. My balls hang down quite far.
I started a couple of years ago with a CB3000, and had a few problems with it, the main being that I could always manage to slip out. Even when I was sleeping I'd wake up and would be out

We then bought a curve, which we thought would be a slightly different idea since it, at least on first appearances looks a little bigger. But had the exact same problem, I could slip out, and if we went down in size my balls would turn a interesting shade of purple.
So what I'm wondering is :-
Was I just doing it wrong? Am I doomed not to be chaste? Or am I just being a wimp and will get used to the purple color and pains after some time? Or is there some other device which might suit me a bit better?
Many many thanks in advance!