Jimbo
I hope you checked the water levels in every cell once the batteries cooled down. Then added enough to just cover the cell plates. Then did a slow charge rate, recharge. Finally refilled all the cells again after the batteries were at room temperature.
Be EXTREMLY thankfull you were using true Lead, flooded cell , deep cycle batteries. I do not know of any other type of battery chemistery that would take that abuse & say, thank you.
OK maybe A123 LIFEPO4 also. I have run them down to 5% many times. But never with that high of a current overload.
Your EV is one fantastic vehicle.

I would give it a complete recheck. Electrical & mechanical retightening.