I'm fury for my offspec and consequently am not as well geared as you. 12-13k in heroics sounds pretty good to me, given I usually sit around the 10k mark. I'm averaging about 12-13k in raids, so I fall rather short of your dps and I'm guessing you put out 13-16k in raids?
Which is my question I guess. What are your numbers in raids? If you're putting out around 15k+ in 25man raids and 13k+ in 10man, then I wouldn't worry. DPS is not top flight, but its way above the bottom of the pack.