There are alot of things i see wrong with your character, not being mean just saying thats all.
Please re gem for STR for all slots, if you need your 2 blue gems the epic 10str+15stam will do just nicely or you can even do 10crit+15stam. Please get some expertise, you need 26/26 if im not mistaken. i understand only being able to do 10mans so youre limited on gear. Alot of people put emphasis on ArP but since its getting nerfed its probably not something you want to shoot for. Heck im a DW frost DK and I have very little ArP but I'm a compulsive hit/crit stacker ^_^ I dont have room for ArP in my gear. your 0.53.18 spec is nice, but i went for 4 Killing machine and put the 1 point into Unbreakable armor, its nice for when Heroism/bloodlust and all your other chance on hit spells go off all at once, i think there are many times in 25 man raids i peak over 10k AP but only barley. here is my char for comparison, but remember im doing 25 mans.
http://www.wowarmory.com/character-s...d&n=Sherbatsky