Fixed this for you. At normal progression mode there's absolutley no reason to stack stamina - ever. Get your hands on the
tol barad trinket for the very needed short anti magic cooldown and you're fine.
The need of hitcap depends on your groups lineup and your offtank. If you mt everything and have no dps shaman and no second melee you'll end up on kick duty from time to time (halfus, omnitron, maloriak, list goes on). If there's a blood dk tanking with you.. let him do the kick stuff, dk with hit/expertise is a personal survival gain (due to how deathstrike works) while a warrior reforging mastery/parry/dodge away is a net lost in personal survival.
Hitcapping with your regular tanking gear is roughly equal to a 1000 avoidance rating lost of ~3-4% avoidance.