Unfortunately I have seen them that large myself, once while kiting in the Egmont key channel near some tarpon in the summer about 3 years ago. The very next day pictures of a bull shark attacking tarpon taken by a local tarpon fishing guide were posted in the paper and discussed in the news. It was so big, the fisherman thought it was a great white. Mote ID'd it as a large bull, like this one.
I am confident there are large numbers of them out there this time of year. You really wanna find some?, Charlotte Harbor is insane.