Don't get upset yet,instead get a second opinion.Have a non VA appraisal performed to see the differences between them and the data that was used to come up with the new price.If you truly believe the VA appraisal was conducted incorrectly due to using incorrect comparisons,you can use the new appraisal as evidence when you appeal to the VA appraiser and their immediate supervisor.

By "good," I just mean relatively high quality data that gives you info like Property Owner, Owner Address, and/or how long they've owned the property?  

Hopefully excel to allow slicing and dicing of the data.

Airdna.co (not .com) but buy their raw data, not the report, by zipcode(s).  

Thanks @Bob Okenwa and how would you cross off routes/streets you have already driven down ?

Once you use the tax data, you can then filter through the list of homes to select your specified or "ideal" criteria.

My team and I have crunched a ton of data on the city, and it never made sense to me why people still buy NYC properties for investing; albeit you do benefit from price stability and perhaps even tax reasons given you'll be negative cash flow most of the time. 

Still, investment-positive locations will likely have a price floor (i.e. smaller cities), and thus should not expect to suffer heavy (or any) losses.There are other factors that drive the housing market.Perhaps a more meaningful aspect of how prices are driven in the housing market - aside from interest rate movements - is a stronger economy.

You will also need a good plan, know it front to back, maybe even have an electronic presentation with the data laid out.

Does the PM have competitive data to show you that you are too high?