Of course Sinett and DC were back as class B winners 1981 with the Peterson 48' Williwaw(4) after the boat had won the Bermuda in 1980, although she might not be considered a "46 footer" but rather a "50".
Right, Seymore did not build a Williwaw for '80, but you would think someone would have thought, "Gee, Peterson's designs have been dominating this size for the past 3 years, maybe I should get his latest." But no one did.
The Williwaw 48 footer was a "small" 48 footer. It was put into semi-custom production by Dennis Choate here in SoCal, and was the dominant "Class A" IOR design for about 3 years.
The even wider-sterned Forte/High Noon/Dust 'Em had some success. I prefer the look of these wider-sterned types, but you can't argue with the scorecard.
For rating and all around performance the Dida/Yena/Serendipity shape seemed to be better. The Design 77/Serendipity 43 was without a doubt the most successful single design of the IOR era. SORC Overall wins 3 times (plus class wins '80 through '84), Transpac Class wins, Big Boat Series, LBRW, Chi-Mac Overall, Sardinia Cup, Admiral's Cup, and on, and on, and on...
Then Peterson tried some boats that were actually narrower (Secret Love 45 footer, Bullfrog 55 footer) that were very, very fast.
So there were more ways than one to skin the IOR cat.