Two things that I felt should be included:
The thing to remember about these pairs of states is that none of them are good and none of them are bad. They just are. The significance of Dagaz is working through the transformation process to the point of breakthrough. Some ancient mystics thought Dagaz represents the dusk as well as the dawn. Not just the instant of breaking through to the light, but also the instant of breaking through to darkness. The dawn and the dusk balance each other. They are represented by the morning and evening stars, the cosmic twins of the sky. - http://www.indigosun.com/january1998/perkins.htm
The first thing that Blum says of Ing is "This Rune is akin to the moon...". I'm thinking Lagu might be more appropriate. Mirror, stillness.