Egregious error on my part. In the post above gakerty's, I wrote, "In fact if the compliance of the "heavy" cartridge is low enough, you actually need a lightweight (read low effective mass) tonearm if you want to comply with the recommended rule for resonant frequency."
Obviously, I should have written "HIGH enough", not "low enough", in relation to compliance. I just now spotted my error which was really careless.