I just finished my 3rd week doing this. I try to do it 3-4 times a week. If it's back to back so be it. Usually I hit more line drive HR's and I'm not a masher. First BP session since doing this I probably hit almost half the balls out in BP. Some were on a line drive, some were moon shots. If they didn't go out they were hit hard. We were hitting on a smaller field than what we normally do, but I can definitely tell a difference. For me it's the heavier bat that helps b/c I have so much endload on it. To swing it fast you have to lead with your hands. Kind of like a golf swing. I snap it more and that gives me more bat speed. Don't give up on this.