Question about soul shard Essence of Anguish's 15 stack

The base effect says I get maximum 25% CDR and move speed, while suffer 50% more damage taken.
Now, with the 15 stacks rank-3 effect, does it mean I will get 75% more damage taken, or still 50%?

Still 50%, the rank 3 affect only CDR and Movement speed

Your Movement Speed and Cooldown Reduction can be increased up to 15 times by dealing poison damage to an enemy