I agree with the above post. A step I does not a successful match make. Your step I is good enough to match assuming other parts of your application are solid, especially letters and third year grades. You can start a small research project now or early in the application cycle with a 'research month'. The frustrating aspect is that many schools have first pass cut-offs for offering interviews that are largely based on step I, and this job is unfortunately typically not done by the program director. So if you do apply, you'll likely have to apply to a lot of programs.
Getting to know your chair well is a great first step. Definitely schedule a meeting to express interest and get their feedback, then start showing up to grand rounds regularly to show you're committed.