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Drop marksmans. You are only getting 50% value out of it.
You can replace it with Agility or Endurance if you need the sustain. Also open you up for other weapon choices.
Also, you don't need all of that cost reduction. A single glyph should be enough, and that would let you actually get a decent amount of weapon damage.
Lord and Savior of the Association of Serious S***posters.