Thanks. It's pretty easy to focus on optimizing your app rather than optimizing your business (I see this a lot actually), and it's a bad way to go. Similar to PG's thoughts on raising money as quickly as possible and then going back to work, you should tell the best story you can in your app and then get back to work as quickly as possible. Whether you get into YC or not, your business will still be there waiting, warts and all.