I live in Florida too and have same experience. My ducks free range on 2.5 acres fenced with large clean aerated pond fed with artesian well. The night preditors are numerous. A secure duck house by dusk is imperative!
Regarding laying , I have 2 Saxony, 1 Pekin, and 1 Khaki / Swedish mix ducks that lay in their duck house every day by sun up since they were 7-8 months old. Another Rouen mix just started laying soft shelled eggs over two weeks ago.
Not sure why - the others never did this. She eats same layer feed and forages heavily ( Florida is big heaven ).
She’s never laced a hard shelled egg. What’s wrong?