I know flippers are scaling back because of low inventory and prices have driven out investors months ago despite increasing rents.

As a cash buyer, I said recent sales data would suggest that an offer of 170-180 is about where I would be, of course having not seen the property that could go up or down based on the condition.It was a good chat and he definitely was not offended by my offer, he said he was going to talk it over with his wife and would get back to me if they were interested.I know, this isn't profound but it's a milestone for me anyways :)I will follow up with him next week!

I am focused and driven.  

The appraiser has to make his own decision but can be helped with better, relevant data.  

I want all that data before proceeding. 

Like any asset driven business, you need to set-aside sufficient reserves to ensure the long-term viability of the asset (or whether long-term viability is even an option).

@Nic Bernier Our "momentum" is driven by financial numbers directly tied to Cash flow, cash in the bank, ROI,....  

Going with this strategy, you could publish valuable data/insight/trends about selling in the micro area that is your niche.  

Where do you get the data?

Be an RE data junkie.