Problems I see on Bismarck:

Folks insisting on downing carapace in one go, blowing all their CDs and then not having the DPS for the snakes.

You can do carapace in two jumps, ignoring one in between if you're having issues with the debuff, and save CDs for the snakes if you have to. Snake failure is auto wipe. Carapace not dying in one go is not.