I had someone suggest to me one time to use breath spray... but the one pup I tried it on, it didn't phase him (Debo, the one in my sig line). He apparently enjoyed having minty fresh breath! I was told this by the breeder I had gotten him from, she said it worked for her. But, when it didn't work on Debo, I had to resort to other methods. Biting him back would only entice him to want to play more, at first. But once I got thru to him, he got the point. Different methods work for different dogs. I've not ever dealt with a deaf dog, but my guess would be the method American Pit suggested would work best for you since you're dealing with a deaf dog. I have had other dogs where I had to use the method American Pit suggested, and it worked, where as others would only think it wa a game, and want to bite again. Now, back to Debo.. when I bit him, i didn't bite his lip or his ear... I would put his whole muzzle in my mouth and apply slight pressure (not enough to really hurt him), and hold him there till he whined and wiggled to get loose. I would let him go, still holding his collar, make him look me directly in the eye, and tell him "No bite, bad dog!" Again, it just depends on the individual dog as to what method will work best.
Uh, watchdawg... not trying to be rude, but how much experience do you have with this breed? I'm just asking b/c I see you're new to the board, and notice that yo're already debating and doubting breeders' experience as to training methods and whatnot. Again, not trying to start nothin, but just curious to your experience. There are several well experienced breeders and/or trainers on here that can provide various training methods or advice reguarding this wonderful breed to the lesser-experienced. I haven't been in the breed long, and am not a breeder, but have plenty of experience training many different bully types, as well as other breeds. While I'm not currently a trainer, that doesn't exclude or eliminate my ability to offer guidance/advice to others who have questions.
So, anyways... back to the OP... good luck, and as someone stated above, pick one method and get everyone in the house to conform to that method. Stick with it, be consistant and you should be good to go! Keep us posted and let us know how it goes!