UPDATE TO THE UPDATE: (LOL)
Ughhhhh. My tablet is stupid or something. It stopped recognizing channel 13 again. I started and restarted and it just wouldn't pick it up. Simultaneously, I was running a WiFi sniffer app on my PC and it saw it, no problem. I gave up and went back to "US" and "Auto".
Some devices just don't have the hardware to successfully use Ch 13