The management software may be showing you the raw burst frame rate. Not likely the IP layer rate. Same with WiFi: connection speed might say 54Mbps, but the IP layer yield, after overhead, is 60% or so of the raw rate.
Truth comes from doing IP layer tests that pass through the power line IP adapters.
PC/laptop on each end. Or PC on one end, NAS on the other side's LAN.
Run ping and ensure it's consistent and small number, like 10mSec.
Run freeware Qcheck, and run file transfer (e.g., windows shared folder) of a large (100+ MB) file.
I tested around 10 different 500mbps powerline kits and the PA511KIT gave me the best overall results.
With that said, the connection rate at the far end of the house still wasn't brilliant (orange light on unit), however that is determined by distance and quality of wiring.
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