Here in BG we are not as warm as California i think, but for me coffee and carambolla do better in a shady condition.
Actually all mu tropicals in the gh are shaded with a shade net, dont know the shade percentage of it thought, looks to be something like 25 %. Cherimoya, guava, surinam cherry, dragonfruit and avocado along others doo quite well in there. Coffee is also there ,but i have added two layers of the dense shade cloth on it, since i added it it resumed growth and is doing way better, it stalled before i added the shade.
Our climates are too different so amma stop here and let others that are closer to u share their experiences.