These definitely have a 10kw on board charger as I regularly see that with my EVSE. You may want to go into the settings to see if you have it limited to 3.9kw. There is an option to do that. Sorry, I don't remember exactly which menu, but it's in one in the instrument cluster, not the center console.
'12 LEAF - sold after 7 years and 95k miles
'98 ZX2 - home DC/lead acid EV conversion - sold 2 years after conversion