Advice please

Ok so I am reading up on everything I can for hunters and am still somehow missing out on some decent DPS. On average I can do about 13k on bosses, and I need to get that up more. I believe I am gemmed correctly, have reforged properly, and my shot rotation is:

Hunters Mark ->serpent sting -> Black Arrow -> explosive shot - > Cobra shot
Of course i have enough haste to pull off three Cobras before explosive is ready again and with LnL i use exp, cobra, exp, cobra, exp.

Aside from that am I doing anything wrong? Is there something else I should be doing or do I have any stats wrong? Appreciate any help I can get at this point.
I haven't played a whole lot since 4.0.6, so this may be a little out of date, but here's a few things I noticed:

1) I've always put ES as higher priority than BA
2) Your hit is a little low - try for 8% as a missed ES / BA will be a big dps hit.. this should be your #1 reforging priority (still gem agi)
3) You haste is a little high - any haste beyond about 6% (757 rating) is mostly wasted (unless you have 4p T11)
4) Pay attention to cool downs, I like to stack them at the beginning of the fight during the careful aim phase
5) Other than the above, 13k doesn't sound too bad for survival in your gear, but i'd guess you could pull about 15k in a raid (a made up number... just a guess)

Also, keep in mind that MM is doing better than SV right now.

Hope this helps.

Ok so I am reading up on everything I can for hunters and am still somehow missing out on some decent DPS. On average I can do about 13k on bosses, and I need to get that up more. I believe I am gemmed correctly, have reforged properly, and my shot rotation is:

Hunters Mark ->serpent sting -> Black Arrow -> explosive shot - > Cobra shot
Of course i have enough haste to pull off three Cobras before explosive is ready again and with LnL i use exp, cobra, exp, cobra, exp.

Aside from that am I doing anything wrong? Is there something else I should be doing or do I have any stats wrong? Appreciate any help I can get at this point.

Meh, unless your guild has specific guidelines of "each person must pull X dps" I find very little wrong with 13k. It's enough to beat BH timer and several other timers. Healer mana should last about as long if well geared and aware.

Raids are all about mana timers and enrage timers. Beat both of them, and you're set.