It should help you better analyze and pinpoint what is going wrong.  

Your kind of just pin pointing different details I have chosen to left out to make things more simple.

Is there a way to pin point these zip codes to 4 to 5 so that we can do more intensive and localized marketing?

If damage to the system does occur there are systems (at least one that I personally am familiar with) out there have an easy way to pin point the issue limiting the removal to a tile or two. 4 - And lastly there was a comment about big stackups and vibrations due to movement.

However, the neighborhood has so much different types of homes that it is hard to pinpoint comps.

I am in contact with an agent in that area to pinpoint a "farm" meeting the three criteria J outlined in his book, but apart from that I'm sort of stuck.

Even if you were to pinpoint a specific area that would help a lot.

However, without knowing the quality of the rehab, it's difficult to pinpoint a precise rental rate.

Comping and rehab.Being able to pinpoint the value and also familiarize yourself at least with the basics of what certain things cost (Paint, flooring, cabinets, countertops, vanities, shower tile, lighting, roof replacement, HVAC replacement, window replacement, pool resurface, etc) is crucial to being able to figure out what you can offer / what an investor will pay for the propertyThen learn how to reverse lookup buyers and what they are paying as a % of ARV in certain areas and use all of those things to start making offersPhil is mostly into STRs now not as much wholesaling but I've wholesaled 60 properties in the past 6 months and these are the areas I focus on

So I have been able to pinpoint exactly what section 8 rent would be before I purchased a unit.