Basically we have a modem downstairs in the living getting 320mbps super fast I am using tp link upstairs wired to my xbox and only getting 6.33mbps download speed on a good day. <snip>
Sounds like your powerline adapter is not working well, or the wiring in your property is not good enough to use PLA's.
You should look to get a direct connected Cat 6a ethernet cable up to the room. This will give the full speed from the Hub.
Don't forget ethernet cables can be run outside and back into the upstairs room, it does not all have to be routed inside.
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