[FirstYorkie]

Sounds like you have made awesome progress with Toby so far! Congratulations!

With regard to the chewing/biting, I honestly think the scruff-shake is making it worse. I would stop doing that.

Instead, have toys/bones always close at hand in every room that puppy is allowed in. When puppy starts chewing on inappropriate objects (like people!), tell him no and substitute a toy or bone. You will have to do this millions of times but he'll eventually get it.

For harder bites, when it really hurts, either yelp loudly or yell "NO!" while breaking eye contact, turning around and walking away. Ignore pup for a minute or two and then start over. All is forgiven at this point (until he does it again). He needs to learn that hurting you = immediate loss of your attention.

When he is chewing on a toy or other appropriate item, be sure to praise him! And maybe even drop him a treat. Behavior that is positively reinforced increases in frequency!

In other words, bitey pup = invisible pup. Not biting pup = best little baby in the whole world!

Do NOT engage in play with him that involves biting inappropriate objects (like hands)and don't allow anyone else to, either! He can't understand that biting sometimes is okay and isn't okay at other times.

If the spray works, use it! You won't have to buy it forever, only until he finishes teething!
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What you are doing with regards to potty accidents sounds perfect. Be sure that you are lavishly rewarding (with praise and treats) pottying appropriately. Make it a party!
Behavior that is positively reinforced increases in frequency!