Is the spell power coefficient for Pyroblast! 42.86% because it's instant or does it count as (I think) 115%. Also, I'm sure it's does, but Glyph of Pyroblast affects this right? I mean, it doesn't have the exclimation point, but it must count for both, right?
Yes the glyph does effect Pyroblast!, It's two different spells same damage same coefficient just mana cost that is changed.