Welcome to the boards Fishkiller!
There definitely is Sevengills in Santa Monica as I've been there when they were caught and seen some beasts pulled out. Basically, I used to think only VC had the bigger game, but quickly found out that they are all over , up and down the SoCal Bight.
We caught a tagged 7-gill and got intel from the researcher telling us of all the places they have caught his tagged sharks.
General rule of thumb is famous surfer spots have lots of bigger sharks. When the sun goes down, they come into these areas because of the reefs. It's frustrating in the beginning as some of the guys here took a long time before they got one, but now that they started catching them, their confidence is through the roof.
Also, the Fall used to be a great time, but it varies from year to year the longer we keep these records on them. Winter is definitely a much hotter time to catch them and the Spring has been off the chain for the last 3 years. I've also caught them in the summer, so they are here for much of the year, but summer is by far the slowest time of year for them.
I hope this helps some and good luck! I'm looking forward to seeing your first post with a big shark from the beach!