Another one is the Cavalier 32, with pinched stern lines, but a fin keel this time. They become completely unsteerable in following seas and broach
I disagree with this.
Back in 1977 I spent quite a few hours steering a Cav 32 in a southerly storm off the Wairarapa Coast, running with just a storm jib on (We were heading up from Wellington for the Auckland-Suva race).
There was a lot of white water coming over the back of the boat and filling the cockpit quite regularly. The waves were often very steep and quite large. The worst of it came through during the night, so not much