Keep it up. Keep redirecting to a chew toy, but play with him, don't just give it to him and leave it be. Redirecting worked for us, but it doesn't happen overnight. I added verbal cues as well, if he was playing with the toy, I would tell him "good, good boy!" And got super excited. If he went for me, I'd say "no bite" very stern. 8-12 weeks was awful, but just be consistent, they will learn if you're patient. I saw a big decrease in the landsharking after 12 weeks. If he is just overstimulated and won't give up biting you, perhaps put him in his kennel for a nap.