Hello,
I apologize for my delay in responding. I have made significant progress towards understanding and solving this problem.
Support from Mike at VPI was excellent, and he re-setup the arm, opting for the Benz L2 instead of the Jubilee. He also installed the 3g weight on the arm.
There is certainly less sibilance from the Benz than from the Jubilee, which you can hear in the above recordings, but unfortunately it still wasn't sounding much cleaner than my prior attempts at setting up the cartridge. Mike suggested that if I am still hearing sibilance, then it is due to the cartridge's limits. (my interpretation is the cartridge's limits in this particular tonearm).
Around this time I was also getting a suggestion via email from a member to try the Audio Technica AT33PTG, with its "micro linear needle" stylus. I picked one up, roughly dialed it in, and gave the track a play to find - it was by far the least amount of sibilance I've heard in this track.
Here is a link to it (compare to the Jubilee and the Benz links above):
Audio Technica AT33PTG playing the trackStill not perfect, but a lot better for sure. This $400 cart sounds to me as good in general as the other much more expensive ones as well. Do you hear any flaws with it? It seems that at least with this arm, price does not correspond with sibilance performance.
What I am now wondering is if a better tracking tonearm is out there, and if so, whether or not it would further get rid of the remaining sibilance distortion.