Dodge will always be the best stat for bears until the DR becomes crippling. A problem the other classes don't have since they can also parry and block. But the aim is the same, you're trying to reduce incoming damage as much as possible.
Having more armour might have reduced the damage you take, but if you're asking me as a tank how much damage I should reduce before I try to stop reducing it, my answer will be 100%. Having more armour definately does not cheapen dodge.
Theres a second part where you mentioned exp/hit. Since you're raiding I'm going to purely discuss raids. Exp here is a waste of valuable points. Make the dps chill out more if they over aggro at the start. Hit however is more debateable.
If they expect you to interrupt you want hit. My reccomendation is to get 2 hit trinkets and then put hit into your gear sufficiently to be hit cap when you equip the trinkets. So that when you're not interrupting you can use the tanking trinkets. But I would also suggest to your guild that a rogue/warrior/dk/shaman/cat would be a better interrupter. They should have gotten hit capped to fullfil their role. Why waste your valuable stats to interrupt.
However saying that certain fights like Nef need 3 interrupters. I tend to minimise the chances of a miss in these occasions by putting both tanks on the same mob, drastically reducing the chance of a miss occuring.
In short. Armour doesn't effect dodge. In raids, hit cap is only useful if you must interrupt.