Harrison Creer has been promising a book re the Manx convicts (about 120 it seems spread over a century) - the cases are recorded in Libor Pli (I think - anyway have a look at http://www.ee.surrey.ac.uk/Contrib/manx/famhist/genealgy/emig.htm and the refs off it)

The lists I think you ref are to Trade directories - I doubt if your family would figure on one of these

Also several cases were in the Manx press of the time