> ~3 hours of highway driving the other day used 75% of a full charge and it's taken 30 hours on a 15A circuit to charge back up
Good grief, what are you trying to do? No one charges cars on a wall outlet. I mean, sure, it "works", but yikes.
Take it to a supercharger for 20 minutes, or at the very least one of the copious 6-12 kW "Level 2" chargers you find in parking lots.