It sounds to me like dehydration, but it could also be breathing. I also breathe through my mouth, but I have never had any cramps that weren't a result of dehydration. When I breathe, I make sharp, quick breaths and I don't inhale very deeply. If I need more air, I inhale a little deeper. I really don't think it is that though, since I have run several miles where I was doing nothing but sucking wind as hard as I could, and still didn't get cramps.
Hydration is key. Most people are in a constant state of dehydration and they don't even know it. When you piss, you want your urine to be as close to clear as possible. If you're pissing apple juice, you can be sure that if you go run right away you're going to get cramps. You need to be drinking lots of water the day before you run and especially before bed (if you plan on running in the morning). You don't want to drink a gallon of water right before you go run, so you want to make sure you have been drinking enough water in the hours before.
Warming up is good too, and your warming up routine sounds fine to me.. I don't know a whole lot about warming up though since I usually just stretch, walk for a minute or two and then run.
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