I have an idea on how to fix this: mix it up with wards.
We add ward abilities (like the ones on charms atm) and shuffle talents around. It would look something like this.
Celestial/Warding
1. Glyph of Paralysis
2. Elemental Ward (gives n fire/cold/lightning wards for 6 turns. n rises with talent
level) Instant use.
3. Glyph of Explosion
4. Circle of Warding
Celestial/Signs
1. Life Ward (gives n blight/acid/darkness wards for 6 turns, n rises with talent
level). Instant use.
2. Glyph of Repulsion
3. Circle of Sanctity
4. Glyph of Fatigue
Wards need to be instant cast because otherwise they are not really that good. I don't think it would be broken as right now we have bone shield which works on everything and is activated in advance. Plus, it costs energy, and energy shuffling already consumes turns.
As for glyphs, since they can't crit (as far as I know), I would up the damage on Glyph of Explosion. Lets say double it.

So what do you think?