I really think you can get married in Florida. I'd think consistently "passing" is going to help. But I'd call and ask what documents you need. You can change the gender on your driver's license and social security if you haven't already. If you don't consistently pass, then I'd wait til you do. Being read as male, is going to solve that tricky situation of a person deciding you need to prove things more, which might happen in a conservative state.
--Jay