The Inishbofin, there are two Islands by that name, that you referenced is on the border between Co. Mayo and Co. Galway.My cousin, Tony Tierney says its in Mayoand I say its in Galway.The other Inishbofin is further North along the coast.
Records are very scrace for the time period you've mentioned (1790-1830).Most birth/marriage/death information we have is from the mid 1800's.That has been copied and is available from the LDS church.
I am interested in learning more about your James, Do you have any information on his siblings?his lineage (marriages of his children and grandchildren on Inishbofin, names of their wifes, etc.)As you may, or may not, be aware there were many first and second cousin marriages.
There is one "James" in our database that would have been born in the early 1800's but we have no information other then he was a child born.