Glen, interesting about the camera detection, glad to hear you trail blazers are sorting it all out before I can afford one
I'd connect up the camera requiring the highest throughout to the dedicated link. Alternatively, try different ports on the hub. I've found that my Canon will only connect on certain ports, whereas other devices seem less fussy. I'm sure an electrical engineer would be able to decipher the USB hierarchy and tell us why, but the rest of us just have to go with what works.
Focusing on a dedicated cam is definitely different
on my CCD I just use binning and short exposures and that works well enough. Sharpcap would seem to be the way to go with the 1600 though.