There's nothing wrong with titling comics like this, kind of like how they do it on newspapers. A set of comics under the same name is also easier because you don't have to think of the title. However, you'll sometimes find it advantageous to break from your method because you can use your title to set up your joke.
You can use the narration boxes also, but space is limited, narration is not attractive, and sometimes you need EVERYTHING to tell the joke right.
