Here are two screenshots of the Bloodrage Chrism. The live servers version is on the left and the new proposed U50 version, on Lamannia right now, is on the right.
The Healing Amplification was nerfed by about 35% which is roughly equivalent to the nerfs on many of the other items. For example, on the Sigil of the Triumvirate, the DEX was nerfed from +22 to +14 - a 36% reduction. There are other examples of similar nerfs.
The Calamitous Blows nerf, knocking the Doublestrike down from 10% all the way down to 3%, is a 70% nerf. But, as far as the sheer numbers go, a raw 7% (10% - 3% = 7%) nerf isn't too big of a deal. I think it's excessive, but I can live with it.
What I refuse to accept is the ridiculous nerf to the Bloodrage Defense power which goes from a +30 bonus to PRR and MRR to a +10 bonus to PRR and MRR. That is a big 67% nerf! THF toons will definitely "feel" that reduction of 20 to both PRR and MRR more than the reduction to Doublestrike.
I'd like to suggest changing the Doubleshot loss from a 7% loss to a 5% loss. That's closer to the 35%-40% nerfs I'm seeing across much of the equipment.
The Bloodrage Defense nerf # should be closer to the 35% #. I propose changing that to a +20 bonus to PRR and MRR instead of +10. That number puts that nerf MUCH closer to the 35% number that we've seen.
Devs, please keep in mind the Chrism is a piece of raid loot, and as such, shouldn't be subject to the same scaling that all the rest of the non-raid loot should be.