here is what you have to do
unless you are willing to pay the sales tax in Florida. you cannot register the boat on Florida. You probably can enter The Bahamas with only a notarized bill of sale
and the Florida title. But better check in person with Bahamas.
you will need to mail your I94 to the London Kentucky office of US CBP with proof that you arrived in The Bahamas. Otherwise you might have a problem re entering the US next tome you visit.
probably easier to enter The Bahamas om a cruising permit
and take your time paying the duty and importing.