I am an intermediate investor. I feel stuck. What do I do next?

[Ryan Parnow]

I have been investing for just over 10 years.  I started with a duplex where I lived in one side and rented out the other.  I now have 13 properties.  I feel like I know what I am doing, but whenever I look at my numbers I don't feel like I am making the progress that I would have expected.  So I am going to lay it all out there.  These are the numbers for all the properties I own.  

Some notes: The duplex is a 15 year note, the 2nd mortgage goes to 3/1 House D.  

I feel like I am not getting the money out that I should.  Did I buy some of these wrong?  What should my next steps be?  Sell something? Refinance something? Buy more? Pay down aggressively?