Ok, should I spec to that after 27 or do it partially now? ( http://thottbot.com/mage/t#/gb41 <= Heres what I have now, at level 21) on shatter, when it says a 50% critical hit chance increase does it mean it would be my current chance (about 6) + 50 (56 total), or my current chance + 50% of that chance (6*1.5=9)?