Well, I'm glad to hear there's nothing wrong with the card physically. Still, better airflow never hurts.
Yeah, I think your chances of finding a waterblock for the Classy today are pretty slim. Maybe post a request in the wanted section of OCN and other forums.
I do vaguely recall Classy owners posting that they had to run the voltage tool to get the voltages to hold. But you'd need the patience to search through this thread to find those posts.
There is a dedicated thread for the Classy (and Kingpin) here on OCN which you probably already know about
They appear to have moved on to the newer generations of cards, but maybe one of the older members can help you.