No idea but there are new and exciting torrent technologies being worked on all the time. Things like DHT nodes or turning off anonymous mode can affect speeds. Your other clients may have different settings enabled or disabled or may not have implemented new protocols.
You’ll be better off trying to get a proper network attached storage (NAS) rather than an enclosure. Either buy a pre-made one or make one out of parts. That way you can use the network speeds. Or you could get a usb3 pcie card, they are very cheap these days.