Hi ajr81,
Be sure to talk to your cardiologist about the drugs called ARBs. Please visit www.marfanlife.net, even if you don't have Marfan Syndrome, and check the thread on "losartan."
I would be inclined to put more weight on the CT scan.I would get it followed at least annually and more often than that if the rate of growth is increasing. Have you been evaluated for Marfan's syndrome?