I don’t see Columbia cutting you slack for not meeting their minimum- and frankly, transferring into either Columbia and UChicago as a pre-med junior is just looking for trouble: the amount of core courses you will have to shoe-horn in is daunting. And, as another poster pointed out, your list of schools doesn’t really seem coherent Brown and UChic? Cornell & Columbia?
Also agree with others who have pointed out that if you are truly unhappy you need to cast a wider net. For example, URichmond is a good pre-med option, satisfactorily selective but with better odds than your list so far.