DK vs Pally Tanking

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I'm running 4x shamans and a DK tank. The DK is great because he get's Death Grip - which is useful for rounding up mobs (less movement). But the best benefit is the 13% increase he gives my DPs with Ebon Plague. I used to roll with a pally tank for kings, and a moonkin for the 13% and mark. I replaced both of those with a DK and some drums. And I really hate being OOM on my pally tank - maybe they fixed it with the more recent patches, but my pally tank was always OOM.

I used to have this problem, but it was hugely fixed by Divine Plea + prot talent to refresh it. Glyphed it even gives a 3% damage reduction too. Combined with the change to Blessing of Sanctuary, I have to really try to run OOM on my pally tank.

There are plenty of ways for a pally to maintain a mana pool and still have massive AoE threat. If you're going OOM in 3.2/3.3, you're doing something wrong:
Divine Plea
Blessing of Sanctuary
Spiritual Attunement
Seal of Wisdom
Judgement of Wisdom

First, BoS should always be on. Easy +2% total mana on block/parry/dodge. This is a HUGE change over the old "thorns" BoS.
Second, Divine Plea should always be on with Guarded by the Light talent. That'll give you 100% of a mana bar per minute.. or 10% total mana per 6 seconds. Again, HUGE, and the higher your INT (mana pool), the more beneficial this skill is.
Third, use Judgement of Wisdom over Judgement of Light. Judgement is a part of 96969 rotation, so get extra mana here. The holy damage of the judgement is the same, and the less healing received by Judgement of Light means more mana from player heals from Spiritual Attunement.

I don't have Spiritual Attunement glyphed and only talented 1/2. With BoS, DP, and JoW.. I still don't need more than 5% mana on heals from Spiritual Attunement to keep a full mana bar.