I'm a healer, and unfamiliar with the new Cata raids, so here's what I see (looking at WoL for all boss encounters):
-You are taking much less damage than the 'main' tank Tyronius. At least I assume he's supposed to be taking more damage, because otherwise HE is the squishy one and you're getting ignored because the healers have to focus on him.
-You're taking almost exactly AS MUCH DAMAGE as the other paladin tank Taufeel (5.74% total vs 5.63% total--you're taking a little less of the overall dmg than him)
-You're taking LESS HEALING than Taufeel (he's getting 7% of the total vs your 6% of the total)
-You're doing MORE SELF-HEALING than Taufeel (you are healing yourself more than anybody but Oyume, doing 13% of your healing received vs his 1%)
So, you're taking the same amount of damage but getting less heals... sounds like a healer problem or coordination problem to me.