For what it's worth, here's what I have on the James/Experience issue.I don't have a copy of the "Otis Papers", but I've been told that there is reference to this marriage in there.
Genealogical Dictionary of New England Settlers "Of this second son, as no more is heard, it is supposed that he died young." (See rest of entry under Austin Bearce)
John Howland of the Mayflower--Volume 2 Experience Howland (1668-) b. 28 Jul 1668; no further record.There is no proof that she married James Bearse of Barnstable, who moved to Halifax, MA.Experience was considered a man until 1930 when the Bearse Genealogy suggested that this Experience might have been a woman, who could then have married James Bearse.No proof has been found for such a marriage.