I may have to test with Shamu further - maybe manually installing that Sept 2017 factory image, and then using HoG to flash the latest OTA and see if it still gives me the same issue or not.
Right now, I cannot be sure if it is something in the BlissROM that is not getting wiped correctly (which makes 0 sense as when I flash the Factory image with HoG it comes up to the initial setup screen, and I set up the device sans Google account and sans any PIN / pw. So, if I manually flash the factory image and then use HoG to flash the OTA, and the issue still occurs, then I know it is with the OTA part. If it doesn't, then I'll use HoG to flash the Sept 2017 factory image and manually flash the OTA and see if it happens.
If it doesn't happen either time, then it *has* to be with the ROM and the initial flash after ROM install, perhaps something in the wiping procedure in TWRP. But that makes little to no sense.
Meanwhile, I'm making a TiBu of my current system on the Taimen, and then will make a TWRP backup of that so I can start playing around on it as well - shouldn't be getting any phone calls any time soon. And They can leave me a msg if someone does call lol.
Then I can try doing some of the same things on the Taimen and see if it also breaks or not.