As far as I understand your situation, you can still have income sourced to FL without filing a corporate return there. Instead of adding "FL" as a state in the return, just source it to "US" instead of "CA." Then you'll only have CA taxes on the CA-sourced income.
*If this (or another answer/reply) solves your problem, please click "Accept as Solution" to get this post out of the "Unanswered" queue of posts.*
