I have been hitting my irons with an in to out swing (I think), but the marks on the bottom of my driver, left by the tee, show a bad outside in swing with my driver. as well as an erratic contact point.(marks on the driver from toe to heal. Just yesterday, I concentrated on a straight left arm through out the swing (as well s keeping it closer to my body), and was hitting the ball much farther, and the tee marks were dead straight and more around the sweet spot. I was not hitting the ball any straighter (I have always hit it straight), but farther. Would a straight left arm have this much effect, or was I just "in the grove" yesterday. I was also hitting my irons much farther.