los angeles here too, i did 35% on my arctic/black interior, looks too dark to me wish I had done 50%. the black interior does make a huge difference in making the tint appear darker... i have posted pics here with my tint and aerokit you can search for them
I'm in Carlsbad and did 17% all the way around. It is not too dark and I am not worried about the law. Knock on wood it has never been a problem before and it really adds to the look of the car.