Adding…my D wanted a LAC and we visited all of schools on the OP’s list (she ended up at a different LAC). I do understand the desire to ED as the acceptance rates are so much higher – some LACs in this range take close to half of their class in the early rounds.
The trick is one needs to have a clear top choice. We did second visits to D’s two top choices in the fall before she felt certain of her top choice school. If the OP’s S is between two schools, think about revisiting (and meeting with the Office of Disability Services if you haven’t done so already) before the ED deadline.