My suggestion is to focus on teacher rec, peer rec and Why Davidson. essay. With so many high stat applicants, those parts of the app are what can make the difference. And yes, click through emails and visit, of course.
When it comes down to it, though, with holistic admissions there’s a level of subjectivity/randomness so no way to pinpoint reasons on why candidate A got in over candidate B. I think that’s if a top college is really your goal you have to play the numbers game and apply to at least 10 hoping the decision goes your way in at least 1 or 2 cases. (And, I’ll add the standard CC advice: have a true safety where the student would be happy and can afford to attend.)