I would skip Dublin if it's a logistical issue getting from Cork to Limerick, Dingle area, and up the West coastal to the Cliff of Mohr. What would be your mode of transportation? if it's a rental ehh...1.5 day in Dublin isn't worth it even though you COULD see the Kells/Trinity college, Guinness Factory, and bus tour in one day if you start out early into evening.
I prefer to keep that extra 1.5 to elsewhere if it meant I could take my time at other sites after Dublin. The rest of the country you want to see is truly beautiful and is what makes Ireland the country everyone talks about. As much it pains me to say skip Dublin as a native of that town, it just isn't worth it, imo.
Mummy to DS1-6/11 and DS2-1/14