I feel as though no Sec 8 tenant is going to be able to pass my minimum requirements, specifically regarding the credit score (my min is 600).

Each will do a credit/background check for you and allow you or the tenant to pay. 

I have letters from their future employees which I'm verifying today and they both submitted to the credit/background check and passed.

My current credit score is ~770 4.  

Fewer banks willing to give credit for imputed equity even if generated through heavy lift entitlements. 

It’s flexible and can help you fund deals quickly.Lease Options: Similar to “rent-to-own,” you control a property with minimal upfront costs and can potentially get a cut of the appreciation if you decide to buy it later.Lines of Credit: If you already own a property with equity, a HELOC or business line of credit can give you accessible funds for down payments or renovation costs.House Hacking: This might sound basic, but if you haven’t tried it, it can be a fast track to building up rental income and experience without a ton of cash down.

Its way easier to take a couple million from a bank or credit union through a Line of Credit than it is to please 100 small time investors with $50k invested.

They are definitely that type - their excuses are always poorly-reasoned, convenient, and kind of dismissive to be honest.

I do a rent by room strategy, and I use a tenant application platform (Turbo Tenant which I love) but they're having trouble inputting their info....Is there another way to verify income, credit score etc with a foreign visa?

Then we'll look at credit and background checks to make sure you don't have a history of fraud.