Rhea,
Kitkat has experience with these and has been doing research for an article that she plans to write here (
http://www.thamnophis.com/caresheets...s_from_Florida). Hopefully, you'll have time to wait, but in the meanwhile, you are correct that the Florida blue is a morph of
T. s. sirtalis, and the bluestripe is
T. similis.
Roy,
Now you know about my... erm vast (?) talents for ID'ing snakes, but that does sort of resemble some of the
T.s. pallidulus that I've seen, though never with that blue coloration. Whatever it is, it's an exceptional snake!
Rick