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Yeah the usb 3.1 gen 2 ports in the back are connected to a single ASmedia controller, but still if only 1 port is used it could work "faster". The single usb 3.1 gen 2 slot on the MB is faster...

So I tested the USB 3.1 gen 2 ports with a 2 drive raid enclosure (ASM1352R, 2x2TB EVO SSD raid 0). MB has three USB 3.1 gen 2 ports, that are divided to a two separated controllers: ASMedia...

So it seems the 2 ports share controller, as having USB 3.1 gen 1 hub connected, with phone and calibration camera(not in use), to the A type port more than halved USB-C Hard drive write speed...