“…because poor performing students were often discouraged from applying in the first place.”
Unfortunately, the weeding is often done during freshman year or in the first premed courses. Most kids with premed intentions don’t get to the point where they need their college’s committee support.
Figures are almost never published for this weed, but it can be the bulk. So what you may want is colleges that are cooperative vs competitive in premed. And info about grade averages in those math-sci classes, not overall. The premed forum may offer you better insight.
Don’t miss the excellent women’s colleges.