Focusing on markets with increasing population and income growth will help to produce those results.

I'm currently at at 83% stocks held being dividend producers and the rest were speculative buys when I first got into stocks that I haven't decided to sell off yet.

This app would mostly serve higher producing agents and team leaders. 

If it's to get at least 1% in rents, then focus on markets and properties that will produce that.

I would like to build a portfolio that produces adequate cash flow at retirement to help supplement income, etc. 

It can easily produce a profit and it gives you access to deals not available to the public.

I have 5 duplexes out of state and they don't produce much cash flow after you consider management fees and maintenance costs.

My #1 goal is to one day grow a portfolio of single family homes + small multi-family homes that cash flow positively, and years from now produce enough monthly income to greatly supplement (and eventually replace) my income from my job (aka, retiring in my 30s).Thanks!

Great price, produces solid income, low expenses, but also has value add opportunities that could make this a really really great deal in the near future.  

Otherwise, take your wholesaling profits and put them to work by owning income-producing properties and real estate-related businesses like self storage, residential assisted living, apartment complexes, etc.