I talk to the right person for sure. I wouldn´t lose a single word if you hadn´t tried putting me down in the other thread about this topic and now, surprise surprise…I gave you exactly these instructions a few posts back here. Nothing more to say, it speaks worlds itself.
Z-Banding guys, just do a belt tensioning procedure exactly how its described in the wiki, do a factory reset and a full calibration afterwards and check your print quality again.