It's quite a bit more than 40 to be honest
Sometimes a bit of introspection is the best path to self improvement. Even if you weren't the root cause of the issue, there's generally always something you can do better to help avoid the issue in the future. Many suggestions have been made that'll long outlast your new gear such as hitting a cooldown just before you park the pull to make that initial damage spike more manageable when you inevitably run into more bad healers further down the line.