OP -
We've talked via PM, and I still assert that with each day, the urgency with which you should be contacting programs increases. The Step 2 thing is indeed an issue, but I worry (speaking about my own situation here, too) that not only are "the numbers" an issue here, but so is time. As I mentioned to you in my PM, one program both congratulated me on my scores AND told me no more interview spots were available IN THE SAME EMAIL.
You might, at this point, email or even call ALL the programs you've applied to in order to make sure they've at least seen your app, and are considering it for review. If nothing else, most of my classmates have gotten AT LEAST an email saying some version of "We got your app but are waiting 'til MSPEs come out to offer interviews".
dc