Hi Diane
If you don't think it's the consistency of your icing (too thick), try giving it a little shake or taping it (gently) on the counter right after you flood. That can help give you a smoother setting ... also, if you notice the dough bubbled in spots during baking, take a toothpick and pop it and push it down, you won't see it and you won't have little 'hills' in your cookies! Hope that helps ... anyone else?