All FHA loan products are serviced to the same guidelines. 

For primary residence #3, we bought in the path of progress; so, not a live in flip per se but similar in that we will get high organic appreciation and also add value through easy rehab such as refinishing floors and railings, replacing fixtures, improving landscaping, upgrading tile, etc.

I understand that IRA loans need to be non-recourse.

Is still better to get FHA loan with 3.5% when I have 20% down payment for the duplex?

Bought it with hard money and then refinanced in a long term DSCR loan.

That improves my ROI and lowers my risk. 

Have you already gotten an FHA loan before?

In my current analysis, I'm (trying to) take that into account during our "move out event", including converting to a conventional loan, renting out both units, etc.

@Igor Balakhnin, the duplex hack with a primary residence loan is one of the most powerful ways to jump start an investing career. 

==========================SAMPLE EXCERPT ONLY===================== This Agreement entered into on the_______day of ___________ , 20_______ by and between, _____________________ and or their assignee(s), herein after referred to as the "Buyer(s)", and _____________________, Herein after referred to as the "Seller(s) ".Seller agrees to sell and buyer agrees to buy the following described real property together with all improvements and fixtures and the personal property described below:Property Address______________________________________________________________________________________Legal description: ____________________________________________________________________________________________________________________________________________________________________________________________________________ County _____________________________________________________________.Personal property included: ____________________________________________________________________Earnest Money Deposit $______________________Cash To Seller At Closing $______________________Existing Loans & Liens $______________________New Loan To Seller At Closing $______________________Purchase Price $______________________The purchase price to be paid as follows: 1.