Strength/parry gems=NO
if your over defence cap i would suggest going for stam gems/enchants.
get argent dawn enchant on helm
get sons of hodir enchant on shoulders OR 30stam 15resil
get 40stam on bracers
im gonna guess your using the ArP trinket cause you dont have a second, thats fine but farm the one from AN heroic 2nd boss Essence of Gossamar (111stam)
get 24stam or 30stam gem in belt/shoulders/boots/legs. or dodge/stam gems
farm the tanking ring from Reg ToC mark of the relentless i think its called and get a stam gem in there
http://www.wowarmory.com/character-s...rub&n=Suneater
thats my pally tank he is an alt but i play him as much as my main. copy his glyphs/spec.
use seal of vengeance, at least thats the alliance one its the stacking debuff one idk name for horde.
you should have no problems with defence and the 2 items you need to farm have great drop rates, as for your mana issue, you might be chosing to use kings instead of sanc, idk. but always prioritize Sanc over kings for yourself.
with sanc up you will hardly EVER go oom. and keep divine plea up by auto attacking from talents