And in
that version of the wall connector, if you have the DIP switches set that way, it's for a 15A circuit, supplying 12A to the car! So
@irish26 that seems to be your issue. If you look at the part number, I'll bet you have this type ending in C or D. Now unfortunately, they didn't have a setting for 60A breakers. They had 50 or 80. So with your setup, the 50 is about the best you can do, supplying 40A to the car. It just happens to be a coincidence that the DIP switches for 50A are the same between both versions of the wall connector. They repurposed some of the less common breaker size settings of 60, 70, and 90 to make the settings for lower level circuits.
Dang, this was a fun mystery!