What should I do to boost my chances?

The only other thing you can do is apply ED to indicate that it’s your top choice.

You might also want to take a look at some LACs. They offer a more supportive, less competitive atmosphere for pre-meds. The ‘weeder class’ mentality doesn’t seem to be as prevalent as a way of cutting down the pre-meds. And getting to know your faculty is important for that committee letter.

If you want to stay in the midwest, check out Carleton, Grinnell, Oberlin, Macalester and Hendrix. But any of the LACs in the top 30+ (to pick a totally arbitrary cut-off) would have strong enough basic sciences to get you where you need to go.