Rattle them bones. While rattling them, blow on your rattling hand. Use short puffs of air, not one continuous stream. That should do it. Eventually, you may develop your own style in dicing.
Some people like to talk about shoes when they throw.
I don't know why. Check out my diagram and color-coded table below. This is zone for throwing Sevens. If a point is established, aim here to hit it. Hit the back wall.