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Have you tried a USB-C connector?
With the USB-C connector allowing for alternate modes, it made sense to bring Thunderbolt to this connector and create a superset solution that supports both Thunderbolt and USB. - See more at: https://thunderbolttechnology.net/tech/faq#sthash.ydL2T7YF.dpuf
Thanks for responding.
Yes... the cable I had on hand was from my Nexus 6P phone... it's USB-C connections on both ends.
However... I get the feeling that it's the cable that's the issue. Although I've read that all USB-C cables are exactly the same... I know the USB-C port on the Nexus 6P is USB 2.0. So... I have a feeling they built the cable to only handle USB 2.0... which bears out that speed I'm getting.
I'm going to head out and buy a USB 3.1 Gen 2 Type-C to Type-C cable and see what happens.