Brice Noonan one thing to remember is the "rules" are not rules but guidelines. You have to look at the actual numbers to determine true cash flow.
The 50% rule is used as a quick method of accounting for things you need to analyze yourself like vacancy, maintenance, turnover ect.
The 2% rule is most accurate at about the 23-35K price point and begins to get less accurate as you go away from there.
Something that you can look at that will help determine the value of the cash flow you are getting is cash on cash return, the value of the dollars you bring in measured against how many dollars you had to put out to get them.
My analysis looks like this with your numbers:
Purchase $80,000
Down Payment $16,000
Interest 5%
Term 30 year
Closing Cost $2,000
Rent $1,100
Payment $343.57
Tax $86.43(430-343.57)
Vacancy 10% $110.00
Turnover $500/yr $41.67
PM 10% $110.00
Maintenance 20% $220.00
Ins 500/yr $41.67
Net monthly Cashflow $146.67
Cash on cash return 9.78%
All those expenses are in monthly terms so obviously you might have some good months with no maintenance and you won't be spending $220/mo fixing things, but when a roof needs replacing you've accounted for the expense of it in the years of cashflow you've already experienced.
Hope this helps you see where the numbers are.