What is distortion due to?

I have been tracking at 2.0 gr, which is what is recommended.
It is a JMW 9, and the buzz is only on some records and is not just in one channel, so I doubt its anti skate.

I'll try a little more tracking force.

Could it be bad pressings?

I'll disconnect one channel at a time to see for sure if it is one channel only.

Yes, it is the highly modulated passages, very loud and high frequency..like human voice (soprano), violin, or upper piano range.

What is the best way to do the "twist" on the wire? Please explain how you can see whether you have it the right way. You know VPI really hasn't embraced anti-skating, although their signature arm does have a mechanism. Maybe I need to upgrade.

OK, I can verify that it is only the right channel that distorts. I checked and did not have a twist in the wire. I increased my VTF to 2.2g, using a digital guage placed on top of the platter. Still the buzz was there. I then put a single counterclockwise twist in the tonearm wire and no help. I then tried screwing with the azimuth, rechecking the VTF after each adjustment. Then I undid the twist and tried different azimuth settings. I tried two twists and it was really bad! It got worse, then better, but never fully gone. Could I have a bad stylus? Was I right in checking and trying different azimuth adjustments? I have checked the routine alignment and overhang with the jig given by VPI. As far as my 51 year old eyes can see, its OK.

Is it possible the cantilever is tilted. It always seemed tilted toward the spindle just a little when I looked at it, so I had originally adjusted the azimuth to try to get the stylus/cantilever perpendicular to the groove, again by eye. I am new to analog so I don't have the experience to know what to listen for. But the channels seemed balanced and frankly I love the sound on most discs. Its just the distortion on some things that is killing it. HELP.

Should I get and try a new cart? I need my analog, cause it beats the hell out of CDs.

I want to thank everyone who responded to my question. The problem is solved. It was the anti-skate, or rather the lack of.

I assumed I needed a counterclockwise rotation of the wire to provide the anti skate. WRONG! When I read the manual it said to balance the tonearm with the counterweight and move the tonearm toward the spindle. It should stop and back up away from the spindle. If not, then untwist the wire one rotation. It turns out that was CLOCKWISE, not counterclockwise, as I had suspected. When I twisted clockwise it applied force in the centrifugal direction, as needed. BINGO. One clockwise rotation and gone was the buzzing at high frequencies. I am again in analog heaven.

I promise to read the manuals carefully from now on.

Thanks again