that’s facinating. i have also heard the Moshe Koussevitzky recordings, and i agree with you that the thrill was the presence and perfection, he was like a king up there.
i never heard the pintchik R”H, but it happens to be, that the first piece of chazzanus that i really heard (I was 10 yrs old),and the one that hooked me, was a snipet of Pinchik from a live shachris at the end of Ahavas Olam. Vrachamecha h’ elokeinu…….. WOW, that totally blew me away!
PS now i see you’re really a maven 🙂