Everyone seems to think you are cramping. It seems to me that your calves are sore from your shoes. I will trust your technique is good. They might be good shoes but just wrong for you and your foot shape. Do the balls of your feet feel a little sore as well as your calves? I had this happen to me, been running my whole life, got some new shoes and all of a sudden calves started hurting. So I went and got another pair of shoes and my calves have never been better. I'm sure you don't want to break down and get another shoe but give it a try. If it hurts enough to post it on here I'm sure it worth 60 bucks for some new shoes. Happy running!