We haven't been hiring tanks for months now, and the market on Stormrage for tanks is generally pretty saturated. Not sure about other guilds/servers, but there's always the recruitment forum here.
Nothing has changed. EH theory is necessary, and avoidance is necessary. Your stamina is pretty high, though saying your armour is too high is a bit el oh el.
Yes, your avoidance is low if you're looking to break into T6 content. Overall your gear is good for the first couple of bosses in MH and probably Naj'entus and Supremus, but if I were recruiting a tank, I would be looking for somewhat better gear overall. The fact that you are using resilience to reach uncrittable isn't in your favour if you are trying to get into T6. The fact that you are sporting a few pieces of Karazhan gear instead of the superior badge items is not helping, either. Based on your armoury I'd guess you don't have a lot of extra gear to swap around, and it looks like you haven't gone much past Lurker in SSC/Reaver in TK.
What you're going to find as you shift into T6 content is that knowing how to gear for the fights is now one of your most important jobs as a tank. Any T6 guild you apply to is going to take it for granted that you generate good threat and don't lose aggro - that's not a selling point anymore.
Hitting the EH minimum is easy - about 20k buffed health is good to go on almost everything through BT. After that you need to pick the right balance of avoidance/threat/more EH/whatever as you come to the fights. That means having the gear pieces ready to swap around to meet the needs of the fight.
A couple things to read:
You might be better off trying to find a guild that is reaching the end of T5 and grow with them. You definitely need to hit up Karazhan/heroics and get the badges to get the new Sunwell badge gear (and some of the older stuff, like Slikk's cloak) if you really want to jump straight to T6.