Do not complain about the noise when you call 911 because it will only be handled as a noise complaint.

I'm not going to lie, it's a GRIND.

My last tenant was there two years and I never had anywhere near this many issues in two years as I've had in one month.Last night the tenant messaged me that the A/C unit was making a funny noise and wasn't really cooling.

So yes most people will want single story duplexes, especially if kids are involved as the noise level from up above can become an issue as well.

Police reports, noise complaints, discussions re unwanted gatherings suggesting drug activity, complete list of tenants and phone numbers. 

Hello friendsI have a rental duplex, and one of the tenants keeps calling me complaining that the other tenants has visitors parking their cars next to the duplex and making noise partying or socializing.

Not saying its not doable, but you'll want to make sure that you don't just grind, but that you have a very focused grind.

Include issues with the dogs, noise, neighbors, maintenance, etc. 

Hire a day-laborer for once a week to take before and after pictures, mow, scoop the poop and clean up trash which includes personal items left in common area (make sure he removes the post it notes which are trash).Only Address specific realistic complaints when they are made in accordance with the terms of the lease or local laws (others don't count) and ignore the noise.

A label such as "introvert" is only noise IMO and not helpful to achieving your goals.