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For optimal bloom, feed the plant lightly with a well balanced fertilizer ( 10-10-10) once a month during the active growing season. Container plants may need to be fed more often (2x month) because the nutrients can leach out from the bottom of the pot when watering. They bloom best when slightly pot bound.
You can remove the wilted florets, this will encourage the lower buds to bloom. Geranium flowers bloom best when protected from rain or spraying water.

This could be Pelargonium Leaf Curl.
Also pests or exposure to a herbicide can cause leaf curling.

https://ipm.illinois.edu/diseases/rpds/608.pdf
https://www.gardeningknowhow.com/ornamental/flowers/geranium/common-geranium-diseases.htm

Good drainage is essential to geraniums so choose containers with adequate drainage holes. If your geraniums are already in pots, spread organic compost lightly on the soil surface and work in, taking care not to dig up the plant's roots.
Feed your geraniums every two weeks with a balanced fertilizer like 10-10-10 or 20-20-20. Buy fertilizer that dissolves in water for easier application.
Every third watering, add Epsom salts - magnesium sulfate - to the plant water - 1 teaspoon per 1 gallon - to provide magnesium. Or, add a slow-release fertilizer to the soil mix when you plant the geraniums in the pot - it feeds them all season.
https://www.gardeningknowhow.com/ornamental/flowers/geranium/pruning-geraniums.htm

They can be planted in autumn in CA. This article may help

http://www.gardeningknowhow.com/ornamental/flowers/cranesbill-geranium/growing-hardy-geraniums.htm

This article will help you access the plant.
https://www.gardeningknowhow.com/ornamental/flowers/geranium/geranium-yellow-leaves.htm

I think you are doing everything you should be doing. You might even take cutting, and divide them. No harm in having more than a few around! Here is an article for more information on their care:

https://www.gardeningknowhow.com/ornamental/flowers/geranium/geranium-care.htm