I have always had that problem, and I had always used the Nestle recipe. Same thing.. great taste, but too thin and look awful.
Until recently. Now, I'm not sure why, but the only thing I can come up with is one of two reasons. Normally, I had always used country crock sticks of butter (I just like the taste of it).. Until a few months ago, when I started using unsalted butter (yeah, it was after watching an episode of Good Eats that I decided to use unsalted in my baking). Nothing spectacular about it.. Just generic unsalted butter from walmart, AND I quit using my hand mixer to make them. I bought a Kitchen Aid with "returned gift" money from our wedding in April. I made cookies for my husband and son to christen the new mixer.
Now, I'm not sure if it was the butter or the mixer, but those cookies were fabulous. I just used a spoon to drop giant spoonfuls onto a cookie sheet. I didn't flatten them or use a scoop or anything, and they spread out to be almost perfectly round and had a great height on them. They looked store bought. I did notice there was a change in the batter as I was dropping them too. It seemed to be more full. It filled the bowl more, and made more cookies. I use to only get a dozen or so small cookies, this time I got over a dozen huge cookies. So, I'm not positive if it was the butter (which I let set to room temperature) or the mixer, but I'm going to guess it was the mixer.
If you're already using unsalted butter, and a Kitchen Aid mixer (or other stand mixer), then I'm unsure what it could possibly be. Maybe you aren't mixing it long enough between steps or something. I'm not really a cookie maker, only make them about once every year or so, so I'm afraid I'm not much help.
I do wish you the best of luck, and I will be keeping an eye on this thread to see if I can learn something myself. I might just have to add cookies to my list of baking favorites.

Holly