Hate to burst your bubble but the problem isn't the bar or the stem, it's the frame. That is simply the nature of the CAAD9 and most other aluminum frames that I have ridden (the CAAD9 is probably even a little better than many of them). You wouldn't really pay much attention to it unless you have ridden other bikes that are better at reducing vibration (like your steel frame).

You can maybe reduce it a little with bar tape (here is a good one - http://www.specialized.com/us/en/bc/...=9331&eid=5097), padded gloves, tire pressure, etc. but in the end, it is what it is.