I am an ortho resident and have reviewed apps over the past few years. Speaking for myself only, I hate to see applicants try to pump themselves up. Nothing is more irritating in a PS than someone who thinks they are the greatest...it makes me think that person is someone I won't enjoy working with no matter how smart they are.
So, I wouldn't address your grades, step 1 score, or AOA status in the PS- those things speak for themselves in the rest of the application.
You should write about the things (not already in the application) that will set yourself apart from the rest of the applicant pool. These can be about anything: interesting life experiences, what interests you about ortho, what interests you about a particular program, etc.
Regarding the letters, I make sure you have a strong letter from an orthopod, but that shouldn't make a difference about when you submit the application. Most programs don't look that hard at the apps until after the dean's letters are released anyway.