I just recently bought a linksys router ac1600 with a usb adapter that is ac580 dual band. I also have have a my book external drive usb 3. The drive has been hooked up to the router and I have tried transfering files from my laptop to the drive and the speeds I am getting are around 1.5 megs a sec. Does this sound right? I was hoping to hit a lot higher. Is there something I am missing?