With your gear, I think it shouldn't be your fault. I've noticed while tanking 10m a few times that the debuff has become laughable. I've been tanking right through it.
It may also be a lack of nature resist that is bringing raid wide damage to you, or a lack of proper cooldown use.
And as I've had to tell people for a while, it's not really about the gear, to an extent. My suggestion is that you try it again, and if you are still having bad luck, isolate the issue.