Low DPS with Fire?

I dont seem to put out as much DPS as I expected with Fire spec in Bg's, Am I better off with Frost wich is my OS, or Arcane.
Look at my equipment and tell me if I have set myself up wrong
You're missing the single most important talent that makes fire spec work in pvp: Shatter. More crits = more hot streak, which is more damage.

Also, from what I've seen a lot of the time in a bg, a fire mage isn't going to focus someone down, necessarily. What fire mages excel at is getting a few seconds to dot someone up in a big melee, then when Hot Streak procs you Nova/CoC (with Imp. CoC talented), Pyro the now-frozen target in the face with tripled crit chance, follow it up with Combustion and Blast Wave/Flame Strike to fish up an Impact proc, and spread those dots to half or more of the opposing force. At that point the dispellers and healers are pretty hard pressed to clear everything off and keep people standing.
I'm okay with Fire in PvP. It's not as good as Frost, but I don't PvP all that often or seriously. You really do need to get as many crits as possible- if I'm doing well, every other to every third spell is Impact or Hot Streak, which means more awesome damage.