Try riding around in the middle ring 90% of the time. Don't worry too much about being in the "perfect" gear. Big ring for long downhills/flats, granny ring for the most extreme uphills, middle ring for everything else. I'm guessing you'll find your gearing is fine. I've got a triple and I never use the granny ring unless I've been climbing and climbing and turn the corner and get that "oh god, that's steep and I haven't got much left" feeling. Then it's sure nice to have it.