I find myself second-guessing my numbers, so having someone with more experience look and tell me I am right or show me where I am off would really boost my confidence. 

Repairs performed with credit cards and cash.

were you able to boost the property's value?

Crowdfunding makes real estate easily accessible, however, in regard to institutional real estate investments, the advice of an expert who works in the industry every day, knows all the players and their track records, and performs due diligence on each offering is a great benefit to you and comes to you at no cost. 

As for the premium, many times Investors will raise their deductibles in order to boost their cash flow.

And maybe some performance bonus .. but no way do you have the earning opportunity as a NMLS licensed MO  .. in my case I am a Mortgage Banker which allows ever more flexibility with income potential as I can work for multiple outlets at the same time..

Surely you can find someone who can perform an appraisal on it, but would recommend thinking hard about the risk vs reward of this property. 

Rahul - The Midwest continues to perform. 

If you put in another $10k or $30k, etc, will it substantially boost your profit?

As long as the numbers work for you, there's ZERO downside to making a seller financing offer, particulary in Georgia, where the seller can easily foreclose on you if you don't perform!