My questions are more a reflection of my desire to understand the "Best Practices" and less of my stubbornness, LOL. 

I have heard horror stories, from Investors getting burn because he/ she thought they could outsmart the system, wanted to be frugal and cut corners, knew more then others, were stubborn, etc.For financing 2-4 Unit Properties, if you want to close in the name of a LLC, Mortgage Lenders will offer you Commercial Loan Terms (25-30% down, a 15-25 year amortization, and a ballon due in 5-7 years).

I'm finding with my current situation that the owner is extremely stubborn and does not want to even talk about the reality of him potentially losing his home.

Honestly with all that considered you could most likely get a sizable ULOC from a smaller bank ( larger banks are a bit more stubborn with these loans).  

I've always been a bit stubborn and set on doing this with only my own capital, but I can see how much faster I can grow my portfolio with access to the additional capital. 

You all can be stubborn and deviant, and that is on you.

In this market in new development, I’ve been able to negotiate lots of concessions (sponsor paying closing costs, credits, customizations) but developers are being stubborn about going off of Schedule A pricing.  

Sellers are stubborn and think they can list at any price and tend to ignore what the market is saying.Get market data by running comps and if you're really desperate, get an appraisal.

That stubbornness on my part lost me out of $250,000-$300,000 in two years time on that one deal.

You really need tpo let go of emotion, passion or stubbornness.