Is this purchase on the MLS or through a turnkey company? 

Of course, every owner's situation is unique and factors like the legal entity involved, purchase date, adequate passive income that can be offset with the cost segregation study, etc., will need to be considered.

I sunk a large amount of capitol into these when I purchased them just to make sure they were nice. 

Nobody who has been purchasing section 8 rentals for 2 years and doesn't understand the costs associated with operating these assets sustainably has any business investing other's money.

Purchase price: $839,000 Cash invested: $83,900Bought an up/down duplex 4 blocks south of Sloan Lake.

There are some markets that you may be able to make a purchase with what you have available. 

Very few non-owner occupied property policies guarantee full replacement cost - they typically provide replacement cost up to the dwelling limit purchased. 

Every house I have purchased was sold "as-is" (good opportunities) and had no bearing on the deal.

Since you purchased your primary recently and in Houston, I personally am bearish on your appreciation potential.

With substantial equity in your Fort Worth rental, a cash-out refinance could free up funds to purchase additional properties.