The first discharge is lower, yes. However I think it could be because the display is not dimming and the GPU might not be downclocking.
As to USB 3, I still think it sounds like no device driver is running. I believe you that it is supported but either that function is turned off or it isn't recognizing the specific controller. I say this because USB 3 should be backward compatible. Basically your device should drop to USB 2 if USB 3 wasn't working, not refuse to work entirely.
A bus station is where a bus stops. A train station is where a train stops. On my desk, I have a work station…