mine did that at 8 weeks also snapped and nipped so much I had to carry him in a blanket. He air nipped. My arm was a pin cushion. I was in landshark he**. I was so frustrated I thought it would never end and came here often for reading encouragement it would end.
Flash forward 10 weeks. He is in day care, his nipping is pretty much down to like 3% of what it was. He generally lets go when you say off. He is acting more like a dog. We can actually walk barefoot again and the only air nips happen when he is excited to see you and forgets.