Hi,
Whatever the cause might be, it has been clear for some time now that a lot of current designs have/had a yaw stability deficiency.
This had been discussed at some length on the contra thread in the context of the contra. As soon as I realised that the deficiency was in he designs I posted those thoughts on here.
However what I realised was that some designers were already moving to rectify that - Namely Suzuki, Seba and CPLR.
Now there are fin extensions and new large fins appearing all over the place.
The strakes, top and or bottom. have been around for some time - indeed some argue that cannalisers act as a dorsal fin/strake.
The fin/rudder group on the Accuracy (Naruke's latest offering) has to be seen (in hand) to be appreciated.
It will be interesting to see where all this goes.

Brian