How much time does Hank spend with other dogs? At 8 months old, bite inhibition should be pretty solid.
I play biteyhands with my dogs all of the time... it's a good way to teach them how much bite pressure is too much. The key is that YOU start the play and YOU end it. If he tries to initiate play, he gets a complete cold shoulder. You can grab a tug toy or just use your hands, and engage him in play. The second mouthing becomes biting, you have to make a noise that makes your displeasure clear (a lot of puppies become desensitized to "No", so try yelping/screeching/growling at him instead) and end the play for a minute or so. If you're sitting, that means you will probably need to stand up and turn your back on him. Then initiate again, and repeat, repeat, repeat. Don't hit him on the nose, he could confuse that with you playing back, it's confusing.
I would also get him around friendly, well-adjusted adult dogs as much as possible. Let them correct his mouthiness (of course, as long as the corrections are fair).
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