These include accidents (I recently had 2 units destroyed by fire), natural disasters (I have had two units each hit by 2 hurricanes), property management turn over (they sell or stop being as good, I have experienced both), or turn over of team (I am turning over at handyman and I suspect plumber), or just wear n tear of property (slab leak in poor location, sewer pipes rotted out (one unit this month), roof, foundation issue, etc.).  

Also, I'd lease out the other bedrooms for additional income as well as practice screening, leasing, and interpersonal comms.  

For selling performing notes, companies like Mission Capital or Watermark Capital Partners specialize in purchasing notes, including DSCR-based ones.

You might want to read our series about “How to Screen a PMC Better than a Tenant”, since selecting the wrong PMC is usually more harmful than selecting a bad tenant: https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processes

Everything is on my schedule every day in a block of time (including shower).

We don't allow any "deal-making" in the forums, which includes advertising your services or properties, looking for partners, etc.

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases.

If the former, note per Union City Rent Stabilization ordinance (https://ecode360.com/15397000 is a slightly outdated version), "the terms of this chapter apply to individual dwelling units within a building, including condominium or cooperative units in the process of being converted, or having been converted".

They didn't really explain what the 10% fee included. 

And typically long term rentals don't make it easy to include property management fees into the numbers and have them still work well.I would consider looking into STR type areas where you can avoid the risk of property damages (str and pm insurance covers almost everything that they might damage) and evictions/collections.