Above poster is absolutely correct, correct enchants and gems are a must before asking such questions.
Don't expect miracles with the number of blue items you have. It's pretty normal to hit 30k once you have all epics properly enchanted. Running heroics will get you some better gear through badges (Chest, ring would be starters).
When enchanting, defense enchants (shield, cloak, chest) allow you to sub out defense gems for stamina gems. Be sure to hit all 3 defense enchants. Also prioritize Argent Crusade faction so you can get their tanking arcanum (def/stam).
Keep grinding away at Heroic AN for the stam trinket, along with other upgrades.
I gave you a list of what you want for enchants above. +crit is fine, but if you want to do progression content as a raid tank, you'll want to change professions for the additional stam that JC/BS will give you.
Jewelcrafting would let you socket 3 Smooth Dragon's Eyes for +34 Critical Strike Rating each (Although this isn't really ideal for holy paladins either) And when you put your tank gear on you could have 3 solid dragons' eyes at +51 stam each.