Daniel:
Welcome to the forum, spelling optional.
F1 FloridaxNorthern hybrids can't revert back to being pure blooded Florida or Northern ("F" and "N" hereafter). Their offspring will have a mix of F & N genes, averaging 50-50 but ranging from mostly N to mostly F. Conditions in a pond may favor either the F or the N traits, so over time the Fx (Xth generation offspring) may come to resemble either F or N more closely.
Think of mixing blue and yellow paint - you get green. It is impossible afterwards to get the color back to pure yellow or pure blue.
Floridas are indeed reported to be often harder to catch than Northerns. A southern PM has to weigh size vs. catchability when deciding what bass to stock (I never had to worry about that - I can have live Northerns or dead Floridas this time of year). In addition, it is the female Floridas that grow the largest. Male Floridas are quite a bit smaller than the females (there is a greater degree of "sexual dimorphism" - $0.50 words for the day - in Floridas than in Northerns).
There are a lot of threads discussing F, N, and F1 hybrids here (as well as some Tiger bass discussions) so search, look, and read.