You're going to need to narrow your stance by about 3-4 inches. The bar is too far back over your foot; when you're setting up, roll the bar forward so it's closer to your toes. You'll then need to lower your butt about 8 inches by bending your knees. From there, you'll need to set your back in extension; if you don't know how to do that, it's explained in the book, and there is also a video for it in the resources section.