So, looked a bit at your gear and...
- for hard-cast Aimed Shot
> wrong enchants put: peerless stats for chest, greater critical strike for back and 50 haste on gloves
> wrong glyph: change chimera with rapid fire
> wrong reforge: you can increase haste and physical crit by lowering mastery.
My advice is to use Arcane Shot as focus dump and use Aimed Shot only when in CA, RF phase and when it procs.
- for Arcane Shot in rotation
> wrong enchants put: peerless stats for chest, greater critical strike for back and 65 mastery on gloves
> wrong glyph: change chimera with rapid fire
> wrong reforge: you can increase haste and physical crit by lowering mastery.