Nathan, congrats on your success so far. When you say you flipped those houses, how did you do that without credit/down payment (hard-money lender)? Or did you wholesale these deals so you didn't need any cash? I've heard a lot of those street signs that say "Real Estate Investor seeking apprentice" are for the very thing you are looking to do - IE find someone with good credit or cash to purchase the home already found by the investor. A few things you may want to try include: 1. Make sure you tell family, friends, and anyone you meet 2) Attend or let people know in the SLC REIA group 3) Post on Bigger Pockets (check) 4) Put an ad on KSL
My only concern with what you said is that these don't appear to be legal duplexes so technically the owner is supposed to live in one unit. I also own a property like this, and rent it out to an extended family and that works great so there are ways to make it work.
Feel free to message me with more details and I'll see if I could help. I already have a bunch of properties so it is a bit harder for me to get traditional financing, but perhaps could be a hard-money lender and/or partner.