Not sure what you mean about the USB 3.0 cables. Tried using them for what?
Sorry, I mean using a USB 3 cable for the USB link between the ECH and the computer. I tried it with an active USB 3 cable and it wouldn't work with my DVD drive, or a 3.5" hard drive. It seemed to be unable to find anything at the other end of the cable. It did work with a thumb drive, an Adaptec EIDE to USB adapter, etc., but only at USB 2.0 speeds. Perhaps the SATA to USB 3 adapter that I have did not supply/supply enough 12V power for the bigger, hungrier drives. Maybe an active USB 3 extension cable would work with a laptop DVD drive, like yours. My plan is to use a desktop (5.25") sized DVD drive.
Edit: Plugging the DVD drive or the 3.5" hard drive, with the SATA to USB 3 adapter directly in to one of the computer's USB 3 ports did work at USB 3 speed. Funny it wouldn't work with the extension cable. Maybe too much voltage drop due the small conductors in the cable?
Am now using a plain, non-active USB 2.0 extension cable and all is working well. It even works well when writing a DVD at elevated speed.