D1: Is there any reason you are choosing to sleep in Limerick? We stayed in Doolin and loved it. It gives you more time in the area. We did a walking tour with John Connolly in the burren and loved it. www.burrenwalks.com/. The boat ride under the cliffs was also a lot of fun and just hiking along the cliffs was great as well. And, remember that if your flight is delayed (like ours was) you may not have as much time as you originally planned that day.
D2: Depending on where you depart from, Doolin or Limerick, you will spend several hours getting to Dingle. I would plan to drive the full Slea Head on D3.
D4: Muckross is great and you will enjoy it. This area has LOTS of great things to see and do. Do you have no interest in anything besides Muckross? ROK? Or anything around Kenmare/Killarney?
D5: County Cork is huge -- is there anything between Kinsale and Kilkenny that you are wanting to visit in particular? Cahir Castle is not too far away from Rock of Cashel.
We really enjoyed our time in the Kenmare/Killarney area. We also really enjoyed Kilkenny, but I think you are cutting Kenmare/Killarney area way too short. Your first day is ambitious for coming off jet-lag, grabbing a rental car, driving to the sights you want to see AND actually spending any time to see them. Plus you'll be back-tracking to Limerick! That's way too big of a day for your first day, IMO. I would personally suggest considering giving yourself more time/nights on the West coast of Ireland and just driving from Kinsale to Dublin straight through, seeing Rock of Cashel on the way and dropping your car in Dublin. We loved Kilkenny but this seems a little rushed to me and that you are missing a lot of what the West side offers, unless you've seen some of it before.