I'm an ortho resident at a big program out west and sit on our selection committee - I help review initial applications and also interview applicants.
First off, you sound like a solid candidate, so relax. You're doing all the right things.
In terms of the application, your goal is to get your foot in the door. Beyond the numbers (grades, Step 1 score, publications), your highest impact will come from letters. Aim to get GLOWING letters from well known national faculty. Away rotations help a lot as well, but only at the program you're rotating through. Lastly, a solid personal statement that highlights your personality, work ethic, and leadership can make a real difference. As you suggested, a lot of orthopedic residents are very competitive and hard to distinguish on paper. The only place in your application where your personality really shows is in your essay, so make it count. This is where you can show that you're a cool, normal person before we meet you at the interview.
Lastly, most essays we read are honestly rather terrible. Mostly they're just poorly written and boring, but some really try to get overly creative and come off ridiculous. Both can hurt your chances. My advise, have people read your essay. For some, it may be worth spending a little $ to have a professional look at it - this is your future after all. When I went through I had the guys at PlasticsMatch look at my essay. They did an incredible job. Have no experience with any competitors so you'd have to look around.