Need advice with Koetsu Black Goldline

Greetings

I wanted to check out Koetsu so I bought the entry level Black Goldline. I'm having problems with tracking. The Koetsu is mounted on a Clearaudio Magnify tonearm with a Clearaudio Performance TT and a McIntosh MP 2000 phono preamp. The problem is that the Koetsu is extremely sensitive to even the slightest warp of an album or any other typical defect you could expect with vintage vinyl. What generally happens is that there are tracking problems with the first song, but after that, the Koetsu generally performs ok, although it seems extremely sensitive to any other vinyl defects. If I mount a different cartridge, I do not experience any similar problems with the same albums.

I have the VTF set to 1.90 and the cartridge is aligned using the Mobile Fidelity Geo Disk. I need some advice about the VTA. Unfortunately, the Performance does not allow of VTA adjustments on the fly. I have to loosen a screw and manually adjust the VTA by hand. It’s virtually impossible to make micro changes to the VTA. Also, how do I determine how much the cartridge should extend beyond the head shell? I have the following cartridges, all of which perform well my set-up: Shelter 5000, Soundsmith Paua, Lyra Kleos and Kiseki Purple Heart. 

My initial thought was that the Koetsu seemed lighter than the other cartridges, and though Clearaudio doesn't publish the effective mass of it's tonearms, I've been able to learn that the Magnify is on the lower end of the spectrum and very light. However; upon checking the weight of the other cartridges, I've learned that the Koetsu is basically the same weight as my Kleos, which performs well with the Magnify. I've considered using a one gram shim, but I got an email from Koetsu advising me against doing this. I’m starting to think that the Koetsu just isn’t a good match for the Magnify.  I would appreciate any guidance that could be provided.

Thank you