From the Robert Looney and Alice Quiney family you have totally omitted and ignored the birth and death of Robert Looney "of Ballasalla" (Malew Parish), son of Robert Looney, who died 7 Mar 1784 at age 86. It appears that this Robert Looney may have been bapt. twice, once on 5 March 1699 while his mother, Alice Quiney was still alive, and again on 6 Oct 1700 after his mother had died, d. 27 Feb 1700. If the second bapt. was yet another Robert Looney, son of Robert and Margt. Quayle, this may explain the burial of the other Robert Looney, 2 Jun 1717 there in Malew Parish.
One thing for sure, the Robert Looney bapt. 5 Mar 1699 stuck around the IOM and Malew Parish until 1784 when he died at age 86.
With all of the births and deaths of Robert Looney in Malew Parish canceling each other out, there is no one left for a Robert Looney of Malew Parish to go to America.