The goal isn't getting the abstract accepted - the goal is producing quality research that is likely to be an oral or podium presentation. Those are the things that really impact your application. So find a good project and devote yourself to it. A lot of times people spread themselves too thin and submit 4 abstracts of low quality which just makes you look unfocused. Your abstract to manuscript ratio is important - bad abstracts don't turn into full manuscripts usually or at least not in good journals.
Also, DDW > ACG in terms of impact.