Visit the Blue Water Hunter shop in Santa Barbara. Some serious spearos hang out and work there. I hunted the back side of Catalina with a young guy named Will (and another guy who like me, lives in Orange County) who works there. I'm sure the folks in that shop can hook you up on some good spots. Malibu is just south of Ventura and I've heard of some areas there that are frequented by WSB; I've been wanting to give the place a try so if nothing else is happening for you give me a PM and maybe we can meet in Malibu for a beach dive and slay some whites.
Blue Water Hunter in S.B. is
www.blueh20.com