The mfg won't produce a "load rating chart" since there are too many load combinations to worry about. 

Estimated rehab about 44k but may be less ( I wanted to be conservative). 12.99% annual interest rate, Originator fee, 2.99 points, closing fees $990.

Look at property tax rates and insurance rates and how much the taxes can increase.  

I wouldn't expect much FED rate changes.

When we purchased our third home, we did not qualify for the rate as a second home and had to pay the rate as an investment.

In this case you may want to refinance your VA loan on your prior property to restore your original VA entitlement to full prior to your purchase.You can use VA financing for up to 4 units with 100% LTV or 0% down but the subsequent or second use may have up to 1.25-3.30% VA funding fee ( points financed into the new loan) unless if you have a disability rating of 10% of greater on your certificate of eligibility or your COE shows "exempt-eligible veteran."

I am using the Rentometer average rate plugging in the difference between the rates.

Rates have improved this week.  

The higher the value the lower the monthly rate.  

Hard money lenders are also a possibility, but they often require higher loan amounts and can have steep interest rates.