First off, please make an effort with your language, it is expected.
Regarding stamina, detailed discussions can be found earlier in the thread at a time when Firelands and it's hard hitting bosses were the problem, around page 9-12 I think. It sums up to about: It can be beneficial to stamina-stack if the boss hits hard enough (due to Death Strike mechanics, you won't be a mana sponge the same way another tank class stamina-stacking would), so that you may rely less on avoidance in order to survive until the next "pack" of heals.
Analyze what's happening when (how) you die. If you're living no problem, most tank gearing is just playstyle preferences.