My most recent tanking build for dual UW runs
Attribute:
Healing Prayer 12
Protection Prayer 15
Divine Favor 12
Smiting Prayer rest of the points
Skills:
1. Blessed Aura
2. Balthazar's Spirit
3. Essence Bond
4. Healing Breeze
5. Spirit Bond
6. Protective Spirit
7. Spell Breaker {E}
8. Frenzy
Weapon Sets:
Set 1: Kephet's Refuge (customized perfered; actually make a lot of difference; customized can kill nightmares in 2 hits, otherwise it will take you 3 hits to kill it)
Set 2: Zealous (axe/sword) of Enchanting + Grim Cesta
Set 3: Longbow
Armor:
15 AL set with all Superior runes (105 hp)
Description:
This build utilizes both strong points of Spirit Bond and 55 build. Spirit Bond can be used to tank Smite Crawlers, while 55 can be used to tank Grasping Darknesses (since Darkness's low damage won't trigger spirit bond). Frenzy is used to both synergize with Spirit Bond againsting Darkness, and the increased attack speed can kill nightmares before they rend you; it saves a spell breaker)
My Spirit Bond/55 hybrid UW tank
lightblade
Spectar
I don't tend to have any troubles with graspings at all, trick is to take the quest at beginning and take Aatxes and Graspings at same time so the blades keep you healed up.
sno
I'd switch essense for mending, and frenzy for bonettis
That's just me though.

osk
i hav elemental resistance instead of frenzy to deal with graspings