Strength is useless for tankadins.  All our aggro is from spell dmg and the higher spell dmg bonus one has, the higher threat per spell hit you get depending on the spell coefficients for the spell.
Strength only gives 1 block value per 20.  Refer to the equation  [(Shield block value) + ((Strength / 20) - 1)] at http://www.wowwiki.com/Formulas:Block That's very negligible.  The equip stat that says "Equip: Increases the block value of your shield by x" is the way to get block value.  Strength is warrior's stat for aggro. Tankadin equivalent is the combination of equip block value and spell dmg.
In ohter words, if you want block value , get the equip stat "Equip: Increases the block value of your shield by x" and it will cost less in terms of item value.  If you want more aggro, get +spell dmg.

At Hyjal level, your sum would well over 102.4%, making you well over uncrushable.  Actually kara gear can maek you uncrushable, even blue 70 gear if you mix it up right. Extra dodge and parry is always good.  The lightbringer set has tons of parry and dodge instead of block, keeping you well over uncrushable sum but probably gives a tankadin 30% dodge.

Our holy shield has 8 charges in 8s and is never used up MTing a boss, while warriors have 2 charges in 5 or 6s with their shield block.  Using holy shield all the time during the Gruul and Lurker fight, I had literally 0 crushings in the entire fight even with all the grounding effects taht a MT encounters on Gruul. I wear SSC equivalent and kara gear , and my sum is 103%.