@MichaelLiu , i need to read through your post a little bit more in detail to be sure my position is correct in the tax law. However, you also have to note that if you are a US citizen / GreenCard) you generally cannot assert Tax treaty benefits i.e. benefit position based on treaty assertions like a foreign country citizen living in the USA ( the person was a resident of that country prior to coming to the USA -- even if a Resident for Tax purposes )
Does that make sense -- ? I will come back and really would be grateful if you have any more facts and circumstances to share .
pk
