Same here, mikrotik L009UiGS-2HaxD USB3.0 hub with 2 SSDs and the rose-storage package, the wireless nearly “useless” / weak while using the USB-devices - unplug it, wireless works great.
Little “workaround”:
when storage speed not needed, plug a USB 2 Hub between the devices, you get about 30-40Mbyte/sec.
That is enough for stream video / audio / work with office files etc. if you plan the use “backup” (imaging whole systems) you need more speed
The “fritzboxes” from AVM Germany can reduce the usb speed to 2.0 on their ports(i think is an option for energy savings)
This is a nice option for further ROS versions 
Greets