Your white with purple center violet is surely sororia Alice Witter :-)
I guess your violets you put on the shadiest spot will appreciate some more sun, that's all :-) The point is not that violets enjoy shade place but wet ground. A part shade place is the best :-)
About fragrant violet -> odorata but which one ?? (some cultivar are very strong some others are not) :-) Odorata can be as much invasive as sororia...
I don't see any particular problem with having violets in Florida. Many are living there (native I mean), see the link :-)

All the best
Thierry :-)