Hi,
overall the post is good, but there are some points which are questionable.
In either way you should choose the highest possible stats you can get and effort. I would also recomment to use a Light elemtal Pet or magical Aurora (for additional wisdom). The more wisdom you have, the more is regenerated by Holy Power Explosion. But also a physical Aurora is possible for some more HP through the strength attribute.
Why additional wisdom? Wisdom for a knight is like dex. You don't need it. You will only regenerate more mana with more wisdom by Holy Power Explosion, because it will regenerate 3% mana. But the main mana regeneration will come from healers which are healing you while you have Holy Power Explosion active.
Furthermore this
I would recommend 2 different builds: Max-HP and Average.
Max-HP build takes 5 Protector (Sta/Sta/HP/Def) and 1 red Keeper (Sta/HP). If possible, use 6 Protectors. (but at this moment there are only 5 available)
Average build takes 4 Protector and 2 Endurance (Sta/Str/Patt/Def).
contradicts to this
Using a High-Patt-Build is nonsense in my opinion. No tank needs Patt to do its job right. It might be much easier but one day you come to a point to decide if you want to stand bosses or die because of too low defense. I saw tanks working with High-Patt but they always had been on a risk. And as a tank I do not take any risks. I would recommend not to go for a High-Patt build but the Average build with 2 Endurance stats is still okay.
Having 2 Endurance on each item on your full gear with the runes you listed is waste if you do this for the physical attack on the Endurance. The physical attack is still so low (I am only speaking for highest instances. On lower instances it might be pushing your aggro), that your aggro is the same like with full protector build.
Kind regards