The high Phosphorus might be a problem. You might want to try diluting some epsom salts and applying that around one of the plants to see if that helps. Otherwise, I'd try applying some blood meal and some sort of potash. You're looking for a fertilizer that has an analysis of 10-0-10 or similar where the middle value is zero. Your local nursery probably has something that's suited to your locale.

Since the availability of Nitrogen is very dependent on your soils temperature (although in Florida soil temps usually are not a problem) and the activity of the Soil Food Web, low N levels can simply mean there is too little soil biological activity at the time of the test. Those numbers are specific to the test you used and mean nothing.
How much organic matter is in your soil?
How well does that soil drain?
How well does that soil retain moisture?
What does your soil smell like?
How much active life (earthworms) is in that soil?