Zyx mistracking issue

Why even think about a/s.....I've never met anyone that can hear the difference between too much a/s, too little a/s, or no a/s at all.  If your arm, setup, and cartridge were installed correctly, it doesn't matter.

Dear @vepiteski : Your tonearm/cartridge resonates at around 7hz and that does not seems to be the problem.

According your information you already put around 1000 playing hours on it and if you bougth second hand no one can knows how many additional hours to those 1K has the cartridge.

Your tech confirmed that the tip is ok but I would like to know if your tech checked the tip wit at least 500x microscope and if he is a experiemnetd cartridge tech.

The problem you have could belongs to a damaged stylus tip or carrridge suspension or a tonearm out of stability specs ( maybe at the tonearm bearing or because the internal wiring out of position ).

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.

raul is absolutely correct. That cartridge should do fine in that arm. The Grace is too light. Either your antiskate mechanism is not working correctly or you have a damaged cantilever suspension in which case the cartridge will have to be re manufactured. If you continue to use it you will permanently damage your records. 

vepiteski,  My apologies.  Apparently the VTF you've chosen is within the recommended range of the manufacturer.  Many times people try to cure a bit of mistracking (if that is your problem) by increasing VTF beyond the recommended range.  That's what I was warning against.