Currently, I have my blacksmithing at the highest level, as well as my sagecrafting. I've been socketing epic gems into weapons during the crafting process for a few levels now. I am a little confused as to how blacksmithing bonuses are determined, especially since my crafting stats are maxed. Here's what my screen looks like:
As you can see, every weapon is eligible for a bonus except Chakrams and Scepters. What part of the blacksmithing process determines whether or not a weapon is eligible for a bonus?