Lately I have been having a small problem with generating high TPS.
I do not have access to Ulduar 10M/25M yet.
I run 10M Naxx regularly, and starting to do 25M Regularly.
What I would like to have is some feedback on other experienced DK's for tanking. I am willing to move some points around, but I do want to stay within the frost tree mainly.
Do you have a link to a WWS? What is your rotation? In terms of your gear, very generally speaking here are a couple of pointers that could increase your tps based on gear alone:
1. You are well under the expertise cap. Your hit is good, but expertise point for point is better than hit until the soft cap.
2. Your not specced into Bladed Armor. Point for point, that is arguably one of the best threat tanking talents and should be included in nearly every tank spec imo.
3. You have glyph of D&D. I personally don't like taking this with frost since most of your tps should be coming from BB and HB anyways. I would generally only use it on my opener, and I think a glyph of rune strike or frost strike would help your ST threat a lot and a glyph of HB would take IT out of your rotation allowing you to use an undead rune + blood tap for OB/HB once a minute.
4. The most glaring problem I see is that you are way over the defense cap. This effectively makes your overall avoidance less than it could be. Consider regemming some, or going with the SS rune on your weapon instead of SG. The idea being that your avoidance = tps due to ruin strike. The more you dodge/parry, the more RS procs you get.
Hope this helps, but link a WWS or at least tell us your rotation and we could provide more insight!