12v LFP now at 5.8V. How screwed am I?

[MisterSandals]

By this do you mean to check cell voltage differences when charging is at or almost at the set absorption voltage? It’s set at 14.0V in my case.

Still, i think voltages should be checked at rest. My comment was implying measuring at a high state of charge (peak charge "state", to use sunshine_eggo's wording).

Your battery, as pictured in post #17 is very close to fully charged 13.4V at rest, and with a voltage difference of .007mV (thats 7/1000ths of a volt), its doing just fine. Better than just fine, its doing great.