Well, we asked for a challenge and we got it.
The patch has been out for barely four hours, only European guilds and a few morning US guilds have tried it so far. One guild got it down to 80%, you got it down to 40% and I am sure there are guilds that will be able to get it down to 10-20%. By the way, in P1 healing does not seem as intense, so you may try to have your healers DPS a little bit then.
In any case, it is way too early to call for a hotfix nerf, before more guilds have spent a few raiding nights on it. I'm looking forward to the challenge.