I resolved my rotor "ding ding ding" problem. I couldn't adjust the caliper any better. I saw the rotor has a tiny untrueness. I wasn't really able to true it on the bike (or was too impatient). I ended up buying a Park tool DT-3 for my truing stand and I tried it on the stand.
After that I fiddled a bit with the caliper adjustment and not it works perfectly, all noise gone even when I stand on just one pedal.
I guess it was a combination of a bit fork flex and a bit rotor un-trueness and the rotor is the only part I can fix. The hub cones didn't have play and the center-lock was solid.
Hope this helps someone. sucks to pay much money for the DT-3, but worth it to get my enjoyment back.