I believe that you don't get returns (failed to deliver) with bulk mailers so you don't know which addresses are bad.That's the simple stuff.My advice is to do various mailings that you or some prepares locally, that go out immediately, using 1st class postage.

If you're not having any luck with mortgage brokers (I'd search out the ones who specialize in investments), then go to your local REI meeting. 

Usually, the confidence comes from more reps (seeing more homes and being more of an asset hunter not a spreadsheet warrior) and going to local meetups so you can meet all the other people nearby who are doing what you can't get yourself to do.

@Ritu MahajanBuild a solid local team, including contractors, property managers, and lenders experienced with BRRRR.

That said, be sure to check your local jurisdiction for other regulations.

I haven’t done my first deal yet, but through hiring a local contractor to build my personal residence I had this idea that I don’t hear people talking about.

You'll learn what contractors are good at such repairs, and eventually people will start bringing you "problem properties" with that issue.Another related idea: contact a good local realtor and ask them if they know of any on or off market properties that would be a hard sell for most buyers. 

What trends are local real estate investors in the Greater Nashville area currently seeing or interested in?

You might find a local credit union or community bank that will go to 95 -100%.At one point I called 2 different VA Regional Loan Centers regarding this section in the VA lenders handbook:Assumability - The second mortgage should not restrict theVeteran’s ability to sell the property any more thanthe VA first mortgage.

I highly suggest getting to some local meetup groups...here is BPs list:  https://www.biggerpockets.com/forums/521-real-estate-events-...I also have a full list of the chicago meetups that I can share with you too if that'd be helpful.