In the other topic I suggested that you use the switch primarily for the NAS and its client machines, e.g. for local video streaming to a Mac or SmartTV etc., which would free up bandwidth on the router/AP for your family to access the internet (e.g. via WiFi).
As it stands now, your Mac is connecting to the NAS via switch and via router/AP, so if your family is on the web, this could create a bottleneck. It would be better if the Mac would connect to the NAS only via the switch. (Just my 2¢.)