In just the past week, I've had to deny six applications from agent-led showings because the agents didn’t conduct proper due diligence upfront.

Is it similar to Savannah / Tybee where new STR's can only be in certain zoning areas and there is a waitlist for applications?

I've seen some people house hack a single family home by renting out the rooms, but keep in mind that traditional lenders would not be able to use the income from renting out the rooms (known as boarder income) towards additional income on the application.

Makes sense, but still frustrating.How should I handle the move-out part and make my application strong enough to convince the lender?

A potential issue that could pop up with the refi is your current address on the application being the subject property on a business purpose DSCR loan.

There have been numerous people on BP talking about how they paid application fees but they could never get their loans closed on any deal brought to the company.

Your criteria seem a bit strict for Section 8 applicants.

That means even applicants with a 400 credit score may qualify, increasing the risk of evictions, non-payment, and high maintenance costs.

The case worker may handle getting rid of this tenant for you.If you are going to be a property manager, you need to know the applicable laws. 

Get moving on getting your advertising, application and leasing processes worked out:)