Still getting P0A80, removed pack, and saw corrosion I had never noticed....

Have you checked voltage difference of each battery pack?
Check control module for corrosion..

Use a voltage meter to check continuity when tracing each wire, and I have had success cleaning busbars , and also purchased replacement busbars as well.

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If you don't have the charging and discharging capability to revitalize the individual modules or however you do it then you're missing a vital step I've seen several of my battery packs run fine even with some of the copper wiring that had been heat cycle several times and was now more of a black color the ohms per foot or whatever ratings that generally apply to wire and all seem to be within reason and I have hundreds of these other wires just laying here from packs that I've disassembled in various states of age and disrepair there's a couple of wires that seem to get black these are orange that seem to turn black from the copper color they were but still work fine some even have green corrosion on the end where the angled fitting is to bolt up to the module Just light cleaning and whatnot seem to work fine it's your bus bars nuts those are critical areas they need to be clean tumbled washed reused I use an anti-corrosion spray front and back and after I torque the nuts etc every few months or at least once a year I lift the hood on the side of the battery and looking there with a flashlight and see my anti-corrosion stuff is still there things are looking good on the MFD and the energy mode and we just drive the heck out of the car Don't leave them sitting make sure somebody's going somewhere almost everyday and pretty much no problems I do not have hobby chargers in the setup to reflash or revitalize modules either My battery guy usually hands me a rack of whatever it is 28 modules squeezed up for about 400 bucks ready to go so far it's been a very reasonable deal He's a good guy and does good work.