In all honesty, 16k with your gear is not bad at all. Hunters are in kind of a weird place at your gear level; right now you need haste and crit more than mastery. Also, I'd go for the 365 crafted polearm over the two pieces you have on now, the expertise, as you probably know does nothing for you (until MoP) until you can get the staff off Well of Eternity or the lfr Madness Polearm. Once you get the four piece tier you can basically reforge out of all your haste and into crit and mastery.
Your spec is a bit off. Point of No Escape is kind of useless and three points in One with Nature is overkill. You want points in Careful Aim. I prefer Serpent Sting, Kill Shot and Explosive Shot as my primary glyps (Kill Shot over Arcane Shot, but either is fine once you gear up).
What I found at lower gear levels is that using Kill Command over Arcane Shot as my focus dump was a dps improvement, once I got my 4 piece, Arcane Shot did better.
www.icy-veins.com is a good site to explore, it's very helpful.
Also, what's your rotation?
This is my hunter http://us.battle.net/wow/en/characte...harfrat/simple his talents and glyph are pretty standard.
I use a wolf as my pet, but that's 'cause it's been with me since I made this toon oh so long ago; but I will use my rare lion at times.