I had a look.... in fury do you have another gear set? If not regem every single ArP gem with strength and you'll notice a tremendous difference. With your gear, you could easily do 5.5-6k in TotC 25.
A couple of things to remember (different from Arms):
1) It's all about rage MANAGEMENT, not USE. You need to keep enough rage to hit your WW/BT, but don't let it get so high that you are "wasting" it. That's what cleave/HS are for ->rage dump.
2) You absolutely HAVE to monitor your Slam! procs. If there is one thing that people in Fury have an issue with (if not rage) it is this. I use Mik's Scrolling Battle Text with an audible sound whenever Slam! proc's. If you don't have a sound play when you get the proc... do what Capt. Picard would do: "Make it so."
Have a look in the DPS section of the forum and read TheGreatMe's Fury Guide and watch his vids. It should help paint the picture more clearly. In Fury, strength>all for gemming.