I am in the Palm Bay, FL area and bought an SFR 3/2 for 220k.  30% down, 6.375% rate, and after all expenses, with a property management company, it should cash flow roughly 175/month. 

A certain SF, # of bedrooms, school districts?

I have other assets in Canada but I looking at bringing everything here when the exchange rate is better.

And it's very pertinent to today's environment because it doesn't look like interest rates will be coming down much, if at all this year.

The house is a new construction in a Class C neighborhood.The tenants pay late rate ~50% of time, they damaged part of the garage, they have people not of the lease living there, and they leave trash in the yard.Part of me wants to keep these tenants because:-They do pay eventually-I don't want vacancy-The turnover costs could/will be high-How much more damage could they do?

It is the interest rates at which banks lend to each other and is short for Secured Overnight Financing Rate. 

Should I wait for Spring for greater inventory, or for lower rates to see if cashflow improves?

Being that I get taxed at a higher rate for wage earnings then i do for capital gains I actually take home more for way less work.

They are nearing retirement and have children in school.

A lot of people tend to mingle these things when they talk about "break even" or "cap rate", but that leads to a lot of confusion.Let's use some real numbers which may be easier to understand.