No, but I didn't expect it to since I said every drive was being read, in the array or not. And now I see it's been happening in safe mode as well. The SMART check is set for 1,800 seconds, so that's not it. (I even set it to 0 to make sure)
Update: Found the issue. "BTRFS operation is running".
I just happened to be looking at the "STOP" button when the drives all got read. It grayed out for just a moment and some text flashed next to it. (the button did not gray out every time.) Managed to get a screenshot and could see "BTRFS operation is running". I had an unused drive in a pool that was BTRFS (old drive was going to wipe it). Took the drive out of the pool, deleted the pool. No more checks every minute, drives all spin down and stay down.
thestip's post in Disks Always Spinning Up was marked as the answer