Hi heyhey20,
We are in the same boat. My GPA is 2.74 and I wanna go for MPH in community health or health promotion, specifically in HIV/AIDS. I cannot comment much on your post since I haven't applied yet. But I think a competitive GRE score for the low GPA applicants will be around 1400 or at least 1350.
Also, I think extra curricular is also very important to compensate our low GPA. I am working at a HIV Research Centre as office/research assistant, and ever since I have worked here, I have been attending the talks and conferences. I am planning to go on an internship with UNAIDS if they would accept me. I am not sure if these things would help, but I think it's important that to try everything to fill up your CV and express your interest and determination.