Have you messed around at all with the max charging current options in the car menus? It has settings for 240V and 120V chargers but from my experience, those settings are completely tied to maximum current capability of the charger and not the charging voltage. As an example, if you plug in a 240V charger limited to 8, 10, or 12A, it will be treated as a 120V charger and none of the menu settings for 240V chargers will have any effect on charging speeds. The 120V charger menus will work to further reduce the 8, 10, or 12A coming from the 240V charger. Bizarre. I don't know what the exact maximum current cutoff is before the car considers the EVSE as "240V" and have not tested a 16A unit like yours. Can you try playing with those car menus while charging to see whether the 120V or 240V settings cause a change in charge rate? Also, please post what KW is reported on the instrument cluster with each of the charging current menu settings. Thanks.