Your glyph question is answered in the first post of the thread. Your crit concern is addressed there as well.
I've been curious about something. In a level 80 setting, it's very easy to reach the soft crit cap, enough that it's actually hard to get rid of the extra crit.
In a situation like that, where gear alone gets you to 33.3% crit chance, what's the dps loss from skipping two points in piercing ice to pick up another utility talent? Also, once you have enough crit to not glyph molten armor, what's the best replacement glyph?