Right, Roger,
Dennis A. had several in the mid-1970s. O Crate was one, and at a NATS back then I saw another with a celestial name I can't call up just now. I was very impressed with its turns. He must have made other errors in the figures as he didn't place all that high. There was talk of judges being prejudiced against high aspect ratio wings and their blinding ability to turn... Likely that was more sour grapes than accurate. Judges have improved a lot since then, too.
Doesn't really matter if you do extremely sharp turns if you can't repeat them when and where needed - the figures have other specs that must be met to earn a good score.