Not sure about exact TOGC buff %, but 280% sounds way too high. Exspecialy physical attacks on tanks. My opinion about ICC buffing would be something like this: Remove 30% buff ( blizzard aura ) and add like 50% to bosses physical attacks and a bit more on AOE like abilities which ar avoidable usualy. But please, dont make these damnit hp boosts. Yes, it makes bosses harders, but god damnit i am tiered of killing ICC hc boss hp at TOC