I feel you. I workshopped my writing sample with my local group with very little time before apps were due, and they unanimously said it would make more sense as a novel than as a short story. 💀 We live and we learn. But also, when you're the writer, you see your own pieces with very different eyes than everyone else. I would like to think that some imperfections are okay, since these are grad SCHOOL programs (and so we're all still learning). Maybe if a professor just vibes with what you're interested in and sees that you've made some good choices, that can be enough to make up for anything that isn't 100% polished.