Hi there,
i just started playing a week ago and made a Marksman very close to yours.
Is there any reason you don't use "Black Quiver" for your version? You can snapshot all boni given from "Black Quiver" into your next channeling of Flurry which significantly boosts damage.
Also, Jade Arrow from "Shift" can give you another increase to your damage if you are using Crit Chance for your build.