Its possible to do an Fha streamline refi on an investment property... I did that in 2012. In your case though; you intend the house to be a primary residence; so just refrain from renting it until you close on the refi. Also; you are on the same line of work with good credit history so I really don't see you having an issues with approvals. Be choosy on your apps; make them count with long term goals in mind.