You are right. There is not a wealth of knowledge on the west coast about tunnel hulls, that I am able to find.
The east and gulf coasts appear to have the majority of experienced shallow water [and other] boat manufacturers.
All the shallow water rigs I have seen in CA, OR, B.C. are jets, and my thinking is that with tunnels a boater may experience the mechanical efficiency of a propeller, with [nearly] the shallow water capability of jets.
Yesterday I found a manufacturer that makes tunnel hull boats for jets. I guess that is the ultimate in shallow water capability.
Thank you for the Hewes/Maverick tip.