Yes, you are.
You are ABSURDLY over the hit cap *looks at badge trinket*. I believe for horde the soft-cap is 9% (Soft cap means yellow attacks will never miss, however auto-shots may, NBD). I've had this discussion with so many people. It is basically wasted stat budgeting, the hit is a very marginal gain once you are soft capped, maybe 2-3 more auto-shots will hit netting ~10-20k damage over the length of a fight (super generous on the amount of damage).
However, if you had ArP, Crit, Haste, AP, or Agi in place of the extra hit you'd be better off.
If you miss a Chimera w/o noticing your serpent sting may fall off. (i'm assuming you're mainspec is MM for PVE) And god forbid you miss a kill shot :x
You also don't have any set bonuses. The 2p T9 bonus is next to godliness, I've been holding out for 4p t10 before breaking that bonus (185 frost badges look cool). The 2p T10 is also nice.
Make sure to re-apply Serpent sting at least once when you have optimal buffs (Greatness, Culling, Wolf-roar-thing). This not only reapplies the more powerful SS when you use Chimera, it also makes Chimera do more damage!
Keep sticking to the priorities and spam those steadies when everything cool is on CD. Also, make sure you are using the abilities with cds (Aimed, Chimera, Silencing) whenever possible, delaying one for 1 second delays every shot of that type for the rest of the fight because of that fixed CD.
Lastly make sure to use your long cooldowns (Rapid fire, Readiness, Pet... thing) early and often. I often start a fight by letting my trinket (herkumi's) to build up to 20, reapply my SS then go into my Cooldown phase.
Rapid fire, Chim. Shot+Silencing, Aimed Shot, Pet thing, Readiness, Chimera+silencing, Aimed, pet thing and then Rapid again once it has worn off.
If the fight goes on long enough for another salvo of good CDs make sure Kill Shot gets reset and reused /w Readiness.
This is all rather disjointed, and for that I apologize. Best of luck to you, and get rid of that damn trinket .