Joskin
I do seem to recall reading an article on someone who coarse fished Corrib. I can't recall where I saw it unfortunately, but if my memory is right, it was summarised as being surprisingly good.
I've briefly toured around there and stayed at Oughterad.
The main problem is that is absolutely massive and as I recall, largely very very shallow in the areas accesible from the shore. So you really will need to do your homework beforehand, to even know which areas to target.
If I were you, I would start by emailing Leisure Angling or one of the other Irish holiday companies. The name of the guy at Leisure Angling escapes me, Dave....? He has fished all over Ireland for donkeys years and will know something about it, I am sure.
I've also got some literature from the Irish angling tourist board somewhere. They too will probably be able to help. They have a stall at Chatsworth Angling Fair every year and always have people there who have extensively fished the length of the country.