Hey man I might be able to help a bit. Diamond valley has a load of shad. That's your forage. Use spinnerbaits and cranks that replicate shad. Soft plastics work too. Senkos, flukes, craws. Big swim baits work too. Right now the reports are bad because the bass down here in SoCal are, for the most part, mid spawn. If you can find the beds you can catch the fish. There are tons of videos and articles on fishing the spawn on here. I like to use a biospawn vile craw or other compact soft plastics on a split shot rig or Texas rig to fan cast in likely spawning areas, worked super slow.
