Welcome! I'm new here too, and I'm loving it so far. Everyone has lots of great information.
My little guy is a little bigger than other Yorkies as well. He's about 8 lbs. Maya is adorable!!
Duke's ears are down too. They were up then they fell for a couple weeks, and I read that teething could be the problem. They were up and now have been down again for about 2 months. I have a feeling they will stay that way. I have read you can tape them, but I hesitate as I'm afraid to cause harm to them. I wouldn't worry about her ears she is way to cute now.