Pretty sure the issue was ESET Antivirus. I tested copying 96 frames of DNG files. About 545MB. Plug into the USB2 side, takes 15 Minutes. Not a typo. Plug into the USB3 side (thinking it might be driver issue and maybe didn't really have USB3) and took 6:30. Copied internally from one drive to another, an instantaneous copy. Tried disabling ESET, connected to USB3 about 6 seconds. 65 times faster. Still took about 15 minutes to ofload 63gb which IMHO is very slow, but it's a LOT better than 10+hrs.
I'll try your work around as well. Thanks for getting back to me.