Wow, big list there. Weldone.
For the ones missed out, I can only think of Cathal Ó Searcaigh for Donegal as far as I know he has literature done, he is from Gortahork. And for Galway, there is Máirtín Ó Direáin from Inis Mór. Both writers which are native speakers.
http://en.wikipedia.org/wiki/M%C3%A1irt%C3%ADn_%C3%93_Dire%C3%A1in http://en.wikipedia.org/wiki/Cathal_%C3%93_Searcaigh