For me, I've been improving my break shot by practicing my force follow shots a little more and focusing on where I'm hitting the object ball. Before playing a lot of straight pool, I can honestly say that I wasn't comfortable playing force follow shots. I'm still not to the point where I play shape for force follow as much as I could (I tend to play for draw position), but I know I'm improving in that area and that it has helped me with my break shots.