Thanks! I've been throwing everything I can think at this issue, but in my everlasting impatience I hadn't considered just giving it a minute lol. However, I've let it sit for several minutes with no luck. I just noticed something further up in the logs that I hadn't seen before:
Frequency 5580 (primary) not allowed for AP mode, flags: 0x3f07979 RADAR
Is this OpenWRT telling me that DFS isn't allowed when the device is in AP mode? From what I've collected from other forum posts, this wouldn't seem to be the case. I also don't see anything in the logs that suggest it's even trying to use DFS, but I'll let it sit for a couple hours and see if it decides to figure itself out.