Hey! Thanks for the thought-provoking post. In my opinion, since Plato said that Atlantis was located beyond the Straight of Gilbralter (from his home in Greece), its location would have to be more north west than your proposed site. See this map:
That's where I have always pictured it. Have the earth's plates moved that much in 11,000 years? I don't know anything about that.
What are your thoughts?