I guess not too many people found this hidden change. Although Ironskin Brew buff shows 40% (without T19), now it only increases stagger by 35% instead of 40% (just check any raid fights after 11.05 in warcraftlogs.com or test it with Training Dummy). This nerf is actually equivalent to losing our 2T19 effect and it seems we get no compensations before 7.2.5. I really hate that Blizzard changed key spell without saying anything...