I have just recently have purchased 915 D2, I was hitting it straight and far at the range just prior to purchasing it. I have played 8 rounds with it and have not hit one more than 120 yards and cant figure it out. I have it set to 12 degree loft, the same as my old driver that I normally hit 260 plus. It has the Diamana blue 60 S+ shaft. in it. The ball marks look like I am hitting on the center to slightly toe shots. I am so frustrated, have gone from averaging 45 to 55 in a week. Can anyone make some suggestions?

Thank you