The Pine book by Stone Lantern will have some information, but I don't know just how much I have not read it. It is however; my understanding that this book is a compilation of all the material in Bonsai Today. There is another publication: Bonsai International published by Bill Valvanis' organization. This publication has had a good deal of information on the cultivar. Most of his back issues are available from him in a photo-copy format.
As to the Zuisho being pretty much like other Pines? This is really not true according to what I have read. There are a number of vast differences, even from other JWPs, that make this tree unique. Two particular differences, fact; it takes ten years for a Zuishio to reach the stage of maturity where it starts to demonstrate the traits that make it desirable for bonsai. Two; is that fact that it can be grown quite successfully from cuttings. You will, if you are really interested, have to research the archives of both Bonsai Today and Bonsai International.