I've been having the same problem...but I've realized I don't have sweaty hands and I even added a larger grip to my driver. It only happens when I am using my driver and my 3 wood. I thought the club was twisting in my backswing, but I finally realized it was the fact that in my backswing I was keeping the face of the driver shut facing up to the sun, rather than at a 45 degree angle. When the club face ends up facing the sun, when I bring it back to square with the ball, the club face stays shut...therefore creating the illusion of twisting... I would compensate for this in my swing by bringing my hands forward of the golf ball and it would cause a duck hook. Hope this helps. Here is a link that may help you understand it better. Watch the video on the shut clubface.