[BlackjackNY]

Another brother hitter with the same problem as me. While I don't have you distances(spending a 12 hour workday sitting in a chair doesn't do much for physical fitness), I do have your problem. I have started to incorporate a pause at the top of my backswing(Ted's comment when I showed him- "that's the best swing you've made all day!"). Otherwise, I get a vicious OTT move caused by my impulse to kill the ball(after all, I'm a hitter, right?)
If you want to try counter-balancing your driver, check out Balance Certfied's website, or if you like to fiddle with your own clubs, I have a word document that shows you how to do it yourself that I got from the GEA website. I have not tried either, but have heard good things about both.