I also requested the 17th, because I'll be in DC to visit Georgetown the week before and am hoping to avoid having to stay another extra night. It was interesting to read about your different approaches to the application essay. I wrote about the 13 dimensions, but I tied them to my experience as an intern with the Department and to my experience as an LGBTQ activist. The consul under whom I interned was one of my recommenders, and I asked him to try to focus on the 13 dimensions as well, so maybe our writing just complemented one another's!
I am a nontraditional college student, not having begun my undergrad until I was 31 years old, and I never quite know how people will react to my age when I apply to these things. I've been successful in every academic application I've completed since I started college - including the Gilman Scholarship, admission and scholarships to the Sciences Po exchange program, and all three of the top grad schools to which I applied. Nonetheless, I do every once in a while get the sense that some academic authority figure has a negative reaction to me based upon my age. I hope that doesn't happen on April 17!
Best of luck, and I hope to see you next month. I'm going to start writing daily practice essays tomorrow, catching up on my back issues of Foreign Affairs, and recruiting friends to grill me in mock interviews.