Here are some changes you can do. For your item level, aim for 6637 haste and rest mastery.
1 - You can go higher it does not matter but if you are close to a threshold, it is worth going for.
2 - Take a look t link and do those gem and reforge changes.
Switch 5 green gems (hit mastery) with hit haste. The reforge is done without gem enchant reason why i went with 6637-170(from enchant).
5*160=800 so you can also replace 2 yellow with 320 haste. 320*2= 640-800=-160 and a green one with haste hit.
Conclusion : either replace 5 mastery hit with haste hit or 2 mastery with haste and 1 mastery hit with haste hit.
Your next plateau to keep in mind is 9211 without sacrificing to much mastery.