MIAMI — While the ex-premier of the British Virgin Islands remains locked up in Miami after being convicted of cocaine smuggling, a federal judge still cannot figure out how to resolve doubts raised by a couple of jurors about their guilty verdicts nearly two weeks ago. U.S. District Judge Kathleen Williams said this week that she wants both sides — federal prosecutors and defense attorneys who are at loggerheads — to return to her courtroom on March 7 with a potential legal solution to the seemingly intractable problem. “From the start, this has been an unusual case in many respects,” William…