William Kissick B Abt 1742 Isle of Man

I am seeking psitive identification of William Kissick, born about 1742 on the Isle of Man. This individual came to the Boston are and married Elizabeth Whitman on July 7, 1768; he fathered 6 known children, Elizabeth b 1769, Francis Whitman b 1771, Polly b 1773, Sally b 1774, Sarah Pain b 1776 and Abigail unknown birth year; he died about 1798 in Boston. He was 1st Lieutenant abord the Revolutionary War Privateer Lee; then went on the become master of the brig William & Grace, which was taken as prize off the coast of England. I have found the British Admiralty records of the trial regarding the William & Grace, but have not been able to verify William's birth date or parents or his exact date of death.