How frequently should I increase rent assuming that the $1400 a month is fair?

However, I have read that these rentals may bring in less revenue although easier to manage due to less frequent turnover.

Additional liability, maintenance, frequent painting, rust etc.

One of the things I have started doing is looking for the types of chain restaurants that my ideal tenant will want to frequent as they will have already done the market research for me.

And if they start to rise, that frequently creates more demand as people who have been thinking about buying decide "It's now or never." 

Although those type of phone calls don't happen frequently, I think it's important to be aware of it upfront. 

So expect more frequent and high unforeseen costs coming your way.

for those who are opening up addresses in Gmaps frequently, I put together a chrome extension so you canhighlight address > right click highlighted text > button there to open address in Gmapshttps://chrome.google.com/webstore/detail/maps-shortcut/nacjnoidlajgponcckmkfoebmipbgbfjhope it saves y'all some clicks (its free)

I don't want owning rentals to be any harder than it has to be, so I frequently let tenants skate by on small or no increases, depending on my own factors.

In reference to your first point, it's one that my wife and I have come across frequently, and, honestly, it's one we struggle with a lot.