@Dev Why, you seem to have a good grasp of the "rules." As you said, they are just for quick, at a glance decisions about whether something should be a good investment.
Since your property basically meets the 2% rule, it should/could be a good investment based on that "rule."
The type of debt service comes into play with the 50% rule when you estimate what cashflow could/should be, again according to that "rule." You just have to ask yourself, "is the potential cashflow estimated by the 50% rule sufficient for me to investigate this property further?" If so, get more details, if not, move on.
A few issues I see: I'm not sure what interest rate you are using to calculate the mortgage payment, but it looks like the monthly payment will be higher than you state in your post. More importantly, since you are talking of doing FHA many people end up putting less than 20% down which will increase the payment and you also have to account for mortgage insurance. Even more importantly, your income won't be $1950, it will only be $13000 since you'll be occupying a unit. So, there probably won't be cashflow (until the future when you might move out and fill that unit), but it could provide a great "house hacking" setup where your housing costs will be very low allowing you to put money into the next investment.
Good luck.