We just returned from Ireland and hit many of the places you are planning to hit. I think your itinerary is very feasible. Just some thoughts:
-We really didnt like Dingle as much as we hoped. I dont know what it was....maybe cause grew up on the coast of NC (where dolphins were a plenty). However, amazing food and good pubs (we pub crawled with a large group of irish and brits one night!). Someone mentioned Out of the Blue. I second that. Fantastic meal.
-We loved loved loved Doolin as our base in County Clare. Yes, it was tiny. But it had so much charm, I cant even begin to explain. We stayed their 3 nights (at a B&B called Daly's House. That lady is amazing. Offering us Baileys and beer every afternoon) and was never bored. I would totally recommend 1. Doolin Music House. and 2. Doing the hike to the Cliffs with Pat Sweeny (you dont have to book this, just show up in front of O'Connor's Pub at 10). The hike was the highlight of our entire journey. It was 5 miles and mostly easy but literally took you on the edge of the cliffs. When we got to the visitor center at the end, none of us even took pictures cause we had so so so so many incredible (and better) views and pictures throughout the hikes. Pat was awesome. His farm and grandfathers back up to the Cliffs).
-I heard Kinsale was fantastic but we didnt have time.
-Close to the Ring of Kerry, I would suggest walking some of the Gap of Dunloe. We just parked (At Kate Kearneys Cottage) and walked till we got tired and turned around. So peaceful. After the Cliff's Hike, this was our second highlight of our trip.
-I know so many people suggest not driving after an overnight flight. However, I say, know yourself. We immediately got a car at 7am after an overnight and took off. We were perfectly fine (stick shift and all!) and were running on excitement. I would just think about how you may feel and make a call from that.
Hope some of these tips help! We loved Ireland. It was our first trip too and will not be our last.