Using power lines can be very hit and miss depending on the condition of the mains wiring.
What router are you running, are you running the hub 4 in router mode ?
One of the issues I see is the default Gigabit Ethernet has a potential frame throughput of 81000 per second and therefore a high throughput for actual data (about 118 MB/s), giving efficiency of 94%, or 940Mbps.
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The hub is in modem mode currently, with a Netgear Nighthawk X6 R8000 between it and myself.
Trying to run the samknows test with it in modem mode just says no router found. Interestingly, when I had the Hub 4 in router mode and ran that test, I was getting the gigabit speed coming into the building!
I was using powerline adapters until this morning but now am running a cable directly from my Netgear router to my PC.