Even simple extras like local guidebooks or maps can make a big difference.

The only exception might be if you plan to and if your market supports short term rentals.

We kept extra bags in the bottom of the can under the current trash bag.

Simultaneous to that, negotiate price reductions to the greatest extent possible because of this extra cost you are incurring. 

Stay disciplined, track your expenses, and connect with other investors for support and advice. 

You said, "I'll have to put in extra of my own money for reserves..."

The reality is the opposite - if it's not in writing then the PMC doesn't have to provide the service or can charge extra for it!

15 - 20 year hold time.The rental investment calculators show that the four $300k properties would have a lot more equity in the future and many times the cash flow after a few years, but does the extra maintenance, management time and expense, etc. outweigh the numbers?

If you don't need the extra money at closing and just want to pay off your current loan in hopes of a better rate, you could consider a rate term refi instead. 

Finally, of the extra $200k, how much are you putting into operating reserves?