Hey I tried the latest release one from here: GitHub - CastagnaIT/plugin.video.netflix: Inputstream based Netflix plugin for Kodi
.. and it now works great, even 1080p is watchable (very slight micro pauses), it uses 180% CPU (of my 400%)
I am not sure why that did not work for you ..
I will need a heatsink for my board though, as I am getting the board stopping after some time of playing, I have the Al case arriving with the built in heat pipe ... that should do it ..