Obviously, I don't want the tenant to move, but their rent is really low. 

Not likely.Your expenses may be a little low. 

I did based on my gut feelings and also what the former owners said about them, the ones I went up by 200 called on everything and the ones I went up less on were low maintenance.

You can have a low-tax or even tax-free cash flow from renting, and often you can have tax losses that would reduce taxes on your salary.These benefits start getting squeezed out when your income is above $100k, but they still exist.What @Yonah Weiss mentioned is an advanced loophole for people with high income, however you will not be able to use it as long as you have a full-time job. 

Your donations of whole numbers were found to be too low and not acceptable.Increase your donations for better response rate...

Now that I have such low equity in it after a year, and I’m moving should I try to pay it down to 20% really fast with the extra cash flow, or just leave part of my VA loan tied up in it for 30 years?

.- Within 1 hour of an airport- Low taxes!! 

Most of my properties are in a low income neighborhood, and my tenants do not all have checking accounts or credit cards, so this has been the best way.

The fee is very low-5.00 per.

Smart way to keep costs low for the tenants while still cash flowing tremendously.