The first is weapon. Getting a better weapon will do a ton for your threat through the Feral Attack Power increase. The second is Expertise - even with the expertise on your staff you are below the dodge cap. At this point expertise is twice as valuable as hit for threat generation.
This is really helpful for me as well. Despite repeatedly succeeding in encounters that should, conceivably, give me a nice tanking staff or polearm - I simply cannot seem to get one to drop. I'm still carrying the Staff of Trickery I've had for ten months. I can't even get Marrowstrike to drop.
I've noticed that I tend to hang right on the line on threat (per Omen) in tough encounters, and I've wondered if my inferior attack power might be a factor. I really think a new weapon should be my top priority now.