I'll give it a shot. Hope this helps
The first place I looked was your hit and expertise. You have 195 hit,
and 35 expertise. Those are both good numbers and should allow you to do
well more than 1100dps.
So the question becomes.. is this 1100 dps overall, or on bosses?
I'm assuming this is 1100dps WHILE TANKING, not offtanking or pseudo
Your crit chance looks low to me. You seem to be about 5.3%. I tend to
run at 10% or more. When tanking trash swap in a threat trinket. Something like
the "mirror of truth" works nicely. If your healers are comfortable healing
you, keep more threat stuff on and less avoidance stuff.
For trash: Charge -> tclap -> ss/cleave -> shockwave /repeat
For bosses, you have the rotation, but make sure you are prompt on using
heroic strike. Use WWS to look at the "normal swings" you have on bosses, you should try to lower this number.
TLDR: I think your crit is low, this is leading to less deep wounds procs
which means less damage. You may also be not using cleave and heroic
strike enough, but that would be a guess.