n=1, but both versions of my challenge/adversity essays that I used were about experiences in high school or earlier, and both topics I wrote about were much, much less intense than something like moving back and forth from a country/culture. I think it's fine if you can demonstrate what you learned and show that it's something you continue to apply to your life and how you do things (which it's clear that you're doing!)
Also, I prefer #1 for your adversity essay. I would shy away from discussing personal/relationship problems.
Your PS, diversity, and adversity/challenge essays are all essentially about the same topic though? I think it's great for you to emphasize your immigrant background, as it's clearly heavily shaped your life, outlook, and passions, but you have only so much space to tell med schools about yourself, and I think it's worth thinking about how you can diversify your image and personality by talking about some different topics. I actually think the diversity essay might be an area to consider talking about something else, as I think it sounds a bit too similar to your PS (at least from your brief summary). Do you have any hobbies or other interests that you might feel strongly about?