Networks Very slow connection over ethernet - wireless is fine

Bit of an update here.

I can get a solid 85Mbps connection if I run an extention from the computer room downstairs to the router, connect the home plug into that.
Then of course the other home plug is upstairs with the PC.

This then gives me a nearly 6meg connection



However If the homeplug is just downstais with the router, and one uphere with the PC (The way its suppose to be) I get a just under 85Mbps(84.26Mbps) connection, which you would think would be fine, however I get this crap.



Edit -

Just a test with the wireless to show the difference.



Also the homeplugs are Solwise 85Mbps turbo