The Problem
Over the weekend my alt DK tank ran normal ToT up to Ji Kun. I'm 501 equipped now, but at that point I was 486 and running with a 503 Prot Warrior. It seemed that no matter what I did, I couldn't touch him on threat - he was always way ahead of me. It wasn't an issue since I was well above DPS, so it's not like it was detrimental to the group. It was just a noticeable difference to me.
My Playstyle
I try to maximize DS usage while still being able to use them when I need to due to having such low ilevel and taking quite a bit of damage due to it. I also try to make the most of AMS to soak as much as possible to throw out as many Rune Strikes as I can since they seem to be heavy hitters.
My Character
http://us.battle.net/wow/en/characte.../Vexium/simple
I'm at 501 right now, but I was 486 at the time so the armory doesn't show the past. I was using the 483 Raid finder Sha-Touched 2h Axe off of the last boss in ToES as well as a few other things that I have since upgraded. I run a mix of DPS and tank gear and it works pretty well for me - I mainly use this toon for heroics, heroic scenarios, and LFR runs so the lack of dodge / parry don't make a huge difference to me.
My healers did comment on how I was squishy, but still healable (they're used to healing a 532 Prot Pally and a 537 Guardian Druid). Because of that, I'm thinking I may need to drop the few pieces of DPS gear that I have to pick up a bit more dodge and parry so I take less damage, just until I get geared up a bit more.
My Question
My query is multi-part: Do DK's have threat issues or was the threat difference only due to the ilevel gap between myself and the warrior, and from what I've described does it seem like I'm playing incorrectly or is there anything else I can do to maximize my threat?
I can't post logs since we rarely ever used WoL on our main runs, nonetheless alt runs, but I can answer any questions you may have.
Thank you for you time.