In my opinon very little of the records you mention have been checked. There must be all sorts of other records to check including my favorite, wills.
The only person I know who has made a trip to Ireland is Stephen E Henthorne from the US. He was probably limited by time as to what he could do. Stephen turned up some very interesting info relating to Isaac Henthorn and Mabel Wildman and the brothers who went to the states. It would seem likely they are related but for me personally I would need more proof before I could accept it as fact.
I think there are lots of records just waiting to be checked but it will require several visits to Ireland.
The link between Ireland and Englad needs more research as well but I am sure that info is just waiting to be discovered as well