Michael, have you ever heard the saying; that practice makes perfect? Well, that's what it's going to take, you're going to have to put some time in at the saw. Once you've spent some time cutting, you'll get used to the ins and outs of your saw and how it should sound. By doing this, you'll get used to how to set the tension on your blade just by feel, and by flicking the saw blade to the right tone. But, it will all take time and practice. With your blades breaking where they are, I'm wondering if your blades is plumb to the blade holders. If the blade holder isn't 90 degrees to the blade when you set the tension, then the blade has uneven pressure at the points where they break. Make sure that the blade is running plumb to the blade holders, and the table and you should have better luck.
Len