Alright, back home in my nerd lab...
I realised that my prod environment was still on 7.0.2 and an old Z-Wave plugin so I updated to 7.0.3 that has Z-Wave 2.0.68 (my dev/test environment is on that already and has the newer Z-Wave plugin Aeon Labs Gen5 stick ZW090).
I then did a full re-sync of the PowerNode 6 that has firmware version 4.27 and did some initial tests.
So cool! All ports are working correct AND all ports report back proper load values when pressing Send Status Request!
I just now have to figure out how to send config parameters to configure it for automatic load reporting when load changes. I´ll read through the excellent tech manual in post http://forums.indigodomo.com/viewtopic.php?p=109978#p109978 that user vrampal kindly posted.
(I´ll also test to re-sync my other PowerNode 6 with the older firmware version 4.20 and see if all ports are working as they should and if power loads are mapped to correct ports.)