Have you considered using some harmless form of positive punishment like spraying water or bitter apple when he jumps and begins biting? It seems obvious that positive reinforcement and negative punishment (taking away attention, giving him time outs, etc) are not working by themselves. Perhaps a combination of harmless but effective positive punishment and positive reinforcement (when he is good and doesn't present the behavior you are complaining about) might help or is at least worth a shot. If that doesn't work, it really does sound like you would need to contact a very good animal behaviorist to help you guys address these issues. It does sound like you're trying to do everything "by the book" in terms of trying to address the problem at the moment.