Sounds like you are on the right track!

Cozy.co website can send the combined application and screening that applicant pays for with their own credit card on your behalf and you get the application and reports once completed.

We have used personal loans, line of credit, credit cards (cash advances) and bank financing.

But if you have a track record of being able to close that should be easy to overcome.

I would start calling smaller banks and credit unions that may be portfolio lenders as they may be more flexible 

You're on the right track with getting a 3.5% FHA loan for the first one - you only get the chance to use it once so use it wisely.  

They offer the "close in 7 days" deal, and get me a underwriters dissuasion before looking for having a property under contract which is the main reason why I choose them.I have a about 10% down, good credit score and low debit to income. 

Conventional will be depending on credit, seasoning, LTV's, DTI etc. 

,My name is Jason and I looking to get more education on the options, requirements, and overall strategy for obtaining unsecured business credit as capital for investment in real estate.

I used mostly credit cards and borrowed money for the purchase down payment and rehab cost, and now that we're finishing up I'm doing numbers on payback and the next property.I want to keep up momentum and start the next project soon, but by my count, it will take me somewhere around 5-6 months to pay off all the debts I incurred in the process of purchasing and rehabbing the house (not including the mortgage).