Oh Lacey this is so encouraging! I told you he would come around! he is a youngster and he wants to play but just doesn't know how to do that with you yet. He will! Try the shoestring through the top of the cage. Let him play with that if he will. He will soon learn you are FUN! I'm sure he wants to get some of that energy used up. Scratching the top of his head while he was eating is a great idea. Get him used to your touch. Maybe you can try the treats with your hand in the cage soon. He is learning that you aren't going to hurt him.
Keep doing the great work and you will know when the time is right to try new things. Your there and can sense when it's ok to do it. Your doing great and I don't think it is going to take long at all to get him adjusted. Just don't push it and follow your instincts. If you let out too soon it can cause a major throwback and you have to start all over!
My personal opinion is to take him to the room where you hang out the most so he can get used to your activities and hear you all the time. Kind of ignore him for awhile until he adjusts to the new surroundings. Just keep talking, and talking, and talking some more!!
I can't believe you have never done this before! You are handling this like a PRO!!!