Ah, you guys are all awesome. Thanks so much!
And yes, I've successfully contacted POIs in every school! I think I have my list pretty much set. I also asked one of my professors, and she said that she was planning on writing that many letters to begin with. So... yeah. I feel much better. I'll find something else to obsess and fret over in a few minutes.
And thanks for the links to the other posts. I was trying to look for them, but for some reason, my search function on the forum kept timing out.
Oh, and FYI for everyone: I emailed my LORs letting them know that I narrowed down my schools, and made a list for them, as well as attached it with the usual (CV, plans, etc). 2 professors replied with how grateful they were to receive this prior to the chaos of the beginning of fall semester, and prior to the last-minute LOR rush in November. I know every person is different, but see if you can send your info to your potential LORs!