I totally get your frustration with the insurance hike. Mine jumped about 20% this year too, and I'm also in the Bay Area. I'm 30, no claims either, but with State Farm.
I was venting about this to a buddy, and he suggested checking out
https://www.insurancecloud.co.uk/ to compare rates. I was skeptical at first, but I gave it a shot and found a better deal. It didn't solve everything, but it definitely helped lower the pain a bit.
It seems like these increases are becoming more common, especially with all the economic changes. I'd say shop around a bit – you might find something better out there.