I'm also having issues after replacing the TL-WPA4220 with the TP-PA8033P.

I dropped in speed (on the same powersockets as before) in 10 fold.

From 65Mbit to 6Mbit on the LAN of the adapter.

Tried out several power sockets and everywhere its the same.

Connected my older TL-WPA4220 and i have directly 65+ Mbit.

I found back in other forum topics that many people complain about the later TP-Link powerline adapters, they seem not to work as the older versions do.

TP link support is not coming back to people, only asking to test it on different power sockets etc and then nothing anymore.

It gets blamed on peoples electricity lines / disturbance, but as many people here can see... older TP link powerline adapters DO work.