I also had no problem with Biopace rings and my own high cadence back in the day. But the rings were designed to improve the efficiency of low-cadence pedaling. Evidently some racers got it in their heads that that meant they were no good for higher cadences and complained about them to some bike magazine writers, who went from praising them one year to damning them the next.

By the way, correct that you used the rings as they were designed to be used? I've never seen the point of second-guessing Shimano's research on pedaling ergonomics, but I suppose it's possible that some people might profit from orienting the rings otherwise. Chris Froome used Rotor's more conventionally eccentric rings in at least a couple of his Tour de France wins, so what do I know?