[noggin]

Of course my tests are much more real life scenario and not theoretical maximum. My NAS is connected to my network via powerline adapters (2000mpbs tplink) and I know its not as fast as I would have hoped, but I get 160mbps to it from iperf on my phone (next to WiFi router from which I also run 6m cable to the laptop/fire stick). The combination of adapters I'm using is completely different though:

https://www.amazon.co.uk/UGREEN-20265-Et...Mwebp_QL65


https://www.amazon.co.uk/KIMILAR-Micro-C...Mwebp_QL65

May be I should try yours...

I use Powerline adaptors in my set-up (Netgear AV500s with GigE connectivity) but they definitely don't achieve anywhere near 270Mbs throughput, and my tests were downstream of them (for both my WiFi and Cabled tests)...  They are just about good enough for many, but not all, BD rips. I'd never use them for higher bitrate stuff.

Are you able to run iPerf taking the Powerline adaptors out of circuit to compare the performance of your uGreen with my Anker GigE/USB 3 solution?  I very much doubt the OTG adaptor is playing any part (though I like mine as the 90 degree moulding is a neater solution than a split cable IMO)

I use my Powerline adaptors for day-to-day connectivity between my living room and my utilities cupboard (which is where my Broadband terminates, and where my Wireless access points, ESXi server running Sophos and other VMs, and unRAID server live).  I trunk 4 VLANs over the Powerline connection (3 of them also exist over separate WiFi access points), but can replace this trunk with a GigE cable connection should I need to (though the cable isn't a permanent solution as it is something of a trip hazard, and living in a building constructed in the early 00s I don't want to try and channel cables into the plaster)