My dmg is low

Hallo cant beat gr 19...i have great substats..purple crit/attacck bonus, all +60% attacck bonus...and my dmg its really low on gr19 and on other events...i mean i saw some video with less worth heroes doing this easy...so i really i can t understand...allo i saw mr bucket nocturne doing like 150k per hit...mine can do barely 30-50k with best gear...i'm wrong in something...using dolores full attacck bonus gear...doesn t help