Well, sorry to necro this after saying I fixed it, but everything works now EXCEPT if I walk away from my PC and leave BO1 running. I don't understand why but the game will freeze my whole PC if I don't interact with the game - for example I was playing solo to test if I had fixed everything, went to go get a pizza out of the oven, and when I came back my PC was frozen.
Super confusing, as it seems my aforementioned fixes solved a lot of the instability errors, but not this one? I'll keep looking into it but if anyone has any information it would be greatly appreciated!