Some positive news:
I paired the ZGR with a Freitas ALC and it works very well - it is a little bit slower than on an OFF+ blade, but everything else works better - dropping the ball short, playing a spinny loop, playing a power loop, smashing, blocking...
So my conclusion is that the ZGR is a top rubber, but needs a carbon blade with medium throw and good control. It does not work on ultrafast low throw blades for me.
Meanwhile I have a ZGX in red and max but the first impression was awkward - it is so different from ZGR. The pips structure is completely different, it has this mushy softish feeling and is much bouncier over the table - the short play or blocks are just worse.
I think that the ZGX is more suited for a low throw blade and for half distance looping and the ZGR for over the table play, which is my style...
I will get a new blade next week - Original True Carbon and try both rubbers there, the blade should be somewhere inbetween Freitas ALC and Persson PowerCarbon, it is told to be a faster Viscaria.
P.S.
I will also get a ZGR in red and max. After the season I will experiment with ZGR both sides on Freitas, it is simply such a good pair and I used it as a BH rubber for fun during training and it works just fine, even for a SP player