Rock Step II. I'm talking 250+. You need to try to get to know your own orhto dept as well as possible. Take calls with the residents, get to know them, etc. Take as many ortho electives as possible. Do externships early in your fourth year. Apply for them in Jan because they fill up fast. You will need someone to go to bat for you.
Do some sort of research.
Even with all of that, nothing is guaranteed. Unfortunately for some, fortunately for some, USMLE is the big equalizer. If you go to a less reputable school and rock the boards you look better than someone at a reputable school who does poorly on the boards. We all take roughly the same test.
If you can take step II early and rock it, that is your best bet, probably. There are review courses out there for it. Plan on taking a month off to study and you may want to invest in the review course. There is a killer one in Kansas City that a friend of mine took after she failed step I. She went up big time. She took the same review course prior to taking step II just in case and was very happy with her results. It is very expensive though. Plan on making rocking step II the focus of the next year of your life. It is hard to sacrifice 24-7 (I've done it) but in the end, you may get what you want.
AOA status will probably help.
I'm a MS IV so my opinion is just that. I hope it all works out for you.