Hey, thank you so much for your thoughts: I really appreciate it. Thanks for pointing out the SEVIS thing as a potential source of concern: I hadn't known that was a possible problem. IIRC though, my ISO was sympathetic to my case and assured me they would disclose the minimum necessary throughout this process, so I'm hoping they were true to their word.

re this:

If you didn't have the question, "Have you ever been unlawfully present, overstayed the amount of time granted by an immigration official or otherwise violated the terms of a U.S. visa?" Then I guess you're good. You disclosed as much as you could.

I don't know if you saw my last edit, but I was posed this question in the DS160 (but not in subsequent interviews); I was confused about how to answer, and asked my ISO about it: they said "you violated your status, not your visa" (I am unsure what distinction they are referring to but at the time I was pretty stressed and didn't think to question this). I answered no to this question based on my ISO's advice. Thinking back, I am uncertain whether that was the correct answer to this question. Do you have thoughts on this?

I've never heard of form I-539, but this is good to know. Thank you again!