For Christmas I received a Perfect Practice Putting Mat. (You know, the one with Dustin Johnsons face on it). 2 weeks after getting it out of the box I still can not get this thing to flatten out. Has anyone else used one and if so how did you get the best results? I have used an iron and some books sitting on it, but haven't had nay luck. The edges are rolled up and will move the ball every single time.