I can't think of anything specifically LA centric to Mafia. Supermob is probably the best of the ones you mention or is at least the one I know for sure has the most information about Los Angeles. It details the various connections between upperworld and underworld and how they shaded into each other.

Black Mass and The Underboss are worthwhile examinations of Boston and New England area.
Double Deal claims to be about the Outfit and associated midwest groups from the sixties thru the nineties.
When the Mob ran Vegas is a pretty quick read.
Vicious Circles is an excellent almost academic explanation of organized crime white collar and extortionate activities during sixties and seventies. It's mostly about NY/NJ and Chicago though there are a few other groups mentioned.

"When the snows fall and the white winds blow, the lone wolf dies but the pack survives."
Winter is Coming

Now this is the Law of the Jungle—as old and as true as the sky; And the wolf that shall keep it may prosper, but the wolf that shall break it must die.
As the creeper that girdles the tree-trunk, the Law runneth forward and back; For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.