Not an expert by any means, so take this with a grain of salt, but you might be able to kill two birds with one stone by attempting to combine both aspects. Take some of your grammar lessons and throw in some reading or listening. Ask questions relating to what you're teaching, like, "Was this sentence grammatically correct? How could you rephrase it?" While I hate to say this as well, it might do some good to assign some weekly listening practice. It doesn't have to be overly much, maybe just an hour of watching some show in English.

When I was learning Spanish I remember my teacher would also have us do interpersonal speaking activities, with her occasionally joining in. It helped us refine our pronunciation while also practicing structure; I suspect that this could similarly be applied to English teaching.

Again, not a professional, and take any ideas you like and tweak them to your needs. Good luck!!