If you're seeing broken spokes in a well built wheel, that's an indicator that there's not enough steel for the application. More steel means thicker spokes, especially in the critical elbow area, of more spokes. Many assume that tighter wheels are stiffer and less prone to spoke breakage, but this isn't the case. Once a wheel is tight enough, tighter isn't better. And stiffness is purely a function of the amount of metal used and not affected by tension (once it's tight enough).