Respectfully I believe you are mistaken. There are two seperate types of "proxies" as you put it. A living will is basically and end of life type document, a life and death time predecision. A healthcare surrogate document is a designation of a party or parties to make medical decisions in the event of inability to make a medical decision. This can be as simple as being temporarily knocked out or a unforseen circumstance during an operation.
Why I warn against is the two documents conflicting. I though I should clarify the legal aspects. You may have personal experience that states otherwise.
If there is a state law which says the living will is a "must follow" I'd sure love to see it. What articles I've seen about the role it plays in Florida is that it is "advice to the proxy."