Hopefully the hot wire and nasty tasting stuff works, but if a horse is a hard-core cribber then you might end up having to talk to your vet about trying something more drastic. I used to board at a barn with one horse that cribbed so bad that when every other option was taken away from her, she would put one leg forward and crib on her knee.
I'd really look hard at what your horse is eating and how often he's getting worked. It may be a simple case of boredom that has become habit. A feed change and increased workouts might help.