If you ever get a notice of a move out be ready to turnover that unit and get it move in ready as soon as you can to minimize the down time.I do understand the "house hacking" loan but 3 or 4 unit house would have decreased the pain of a vacancy. 

Just muscle flexing from tiny souls.

Looking back, is there anything more you could have done to prevent/decrease issues?

This 10k will decrease your rental income.  10k will not impact your flip profit. 

Certainly the margins are decreasing due to both increased government regulation and market saturation.But professionals like Neil Collins here in Portland, who self-manage effectively, and can deal with government wonkage effectively still have profitable margins.  

The addition of the passive income deduction will lower my taxes on an already decreased income tax rate.

All in the budget is looking to be around $400k.Are there any programs on a FHA construction loan to decrease the down payment below 3.5%?

Then they got rid of the contractors (they didn't have to pay the unemployment taxes to the state when they got rid of us), and finally, they had to cut into their own muscle when things got really bad.

Keep in mind a fully maxed out card may temporarily decrease your credit score but it will bounce back as soon as the balance is paid down.

If you get good tenants in your 4 unit that will greatly decrease how involved you will have to be.