Welcome COyorkieLover!! Sounds like you have a full life right now with a new puppy and a move. Coby seemed to have ENDLESS energy. I love puppies but was beginning to wonder if he was ever going to slow down. He's now 7 months old and was just neutered and is finally starting to slow down (from like 150mph to 100mph).
At 5 months old, Rusty sounds pretty normal to me!!