Section 8 comes with benefits like reliable government-backed income, potential tax advantages, and lower vacancy rates.

If they are VERY professional, they will have their processes in writing as verification that policies are enforced equally and fairly by their entire staff.6.

It has more reliable tenants (some of which even fix the property up), more stable and predictable appreciation, and just over-all less work.

With the tenant friendly courts in Denver it's probably not a bad idea to cut your losses and send them on their way with their $630 but just be sure to tell the whole truth and nothing but the truth when the next potential landlord calls you up for a rental history verification. 

I don't really want to hear your life story, but if you have a situation as described in #3, I will consider it, BUT I very well may want verification.

On the application I did put a deadline for all applications and income verification.

Look on zillow and see how long houses are listed before renting (but be aware that zillow often doesn't know a place has been rented so their numbers can be biased long).If she has been a good tenant and paid reliably then I might offer to split the difference and go up just $100.

Firstly, research strategies for remote management, like reliable local property managers.

100% agree @Jabneel Springer.If you are fairly near Alpharetta, I know of a large and reputable community that can help you with reliable resources. 

Given your experience and knowledge in this field, what is your opinion on the credibility of the reports from STR Insights and whether they could serve as a reliable resource for information.