I agree that you can't say the ones in Florida are bigger than the ones in Texas. That would mean the fish get bigger too. Doesn't make sense with a body of water that is connected.
The fleas are there you just have to dig. From what I have read, Florida has been doing it longer with the fleas so it may be that the fleas are easier to find on some beaches where they have found them over the years.
They do catch big fish. I would give it a try.
Let us know if you get one and how it works please!
USAF Retired and Fishing!