So I was trying to make a boss using an Evoker, but when I set the evoker's attribute generic.attackDamage to more than it's default damage, it still does the same damage on me with a full set of Diamond armor with Protection IV. This is the command I have input to summon the Evoker,

/summon minecraft:evoker ~ ~ ~  {Attributes:[

,{Name:"generic.attackKnockback",Base:50}]

I've checked everything but there's nothing wrong with the commands, I even tried giving it a strength buff of 10 but it still damages me the same amount???