Adcoms usually prefer GPA>DAT. If you're worried about your DAT, then I'd focus on raising your Bio and RC, while maintaining or even pushing it to a 3.8 to be super-safe.
If you get 20 AA+, research won't matter as much.
BTW, stats only get your foot through the door--you need to have stellar LOR's, EC's, a non-superficial personal statement, and not screw up your interviews. I had a low GPA myself and I had a very hard time getting my foot through the door.... I don't think you'll need to worry about that, thankfully.