I will also chime in with some anecdotal evidence. I am also a MS4 that expect to match into OB/GYN this year. I also had a low step 1 score (205) and was disheartened at first. My score required me to apply this year with a "back-up" plan - something they make everyone do with certain thershold Step scores. As I am MD/PhD, my back up was the ABIM research pathway but I ended up not going on any of those interviews. My research was in ovarian cancer, so I had lots of OB/GYN related publications and I believe that helped me. I applied to mostly university affilated programs. Overall, I went on 16 interviews, all but 3 were true university programs. So here is my advice:
1) Rock Step 2CK - I took one month to devote myself to study and get as high as a score as possible (237).
2) Work as hard as possible in 3rd year to get honors/great evaluations to show you are strong clinically (I honored two clerkships, OB and Surgery)
3) Apply broadly - while expensive I ended up applying to 62 programs (both university and good community programs) throughout the country. I found it was almost impossible to tell who I was going to hear positively from, and who I would never hear from. There are some programs that are going to filter based on Step 1 alone and they will never see the rest application - sadly just the way it is with the amount of applications programs are receiving. Of those 62 programs, I only ever heard from about 30 during the interview season with 20 of them being invites. I was surprised with some programs that I got interviews at, and at programs I never heard from that my advisors considered "safeties".
4) If you don't have one already, meet with an advisor in OB/GYN, ideally someone familar with the application process for guidance and help in selecting programs to apply to.
5) Relax, have a backup plan of some kind (can be applying IM, applying to every OB program in the country, whatever you need to do to make sure you have a job after match.
As above, please message me if you want to talk more about my experiences as well. Good luck!