I went for the dlink hub, after having the same issues with the hak5 powered hub, it arrived today and works a treat, with both the usb storage and the alfa plugged into the hub.
Will now grab a 2nd usb power cable for the pineapple as this will power the hub from my usb port on my newtrent battery, to have both the pineapple and the dlink hub powered from the newtrent batt.