Allow me to clearify this.

I'm not saying at all that the suggested book is bad in any way, just that it has a limited use with respect to finding optimal trim with modern large squaretop mainsails. The book has a different intended usage, it gives a good generic method for sailing your catamaran, no matter what design specifics it has. As such it gives cat sailors a basis to expand their skills upon.

This expansion (on modern squaretops) is not really covered in the book, the author decided that this was outside of its scope. Nothing wrong with that. It just aims at a different usage.

Wouter