Timewalking instance tuning, certain spell is breaking scale

It’s TBC TW week, I ran some instances and to be fair, the scale is broken.

Trash mob’s Shadow Bolt spell hits roughly 3k range. As a tank, I have 6krish hp.
Mana Drain takes just 1 cast, to empty our healer’s mana bar.
When stunned, I have ZERO armor, mob just shred me like paper.

That is NOT normal.

Blood Furnace seems to be the worst. In numerous trash packs throughout that dungeon there are packs with multiple mobs taking 1/2 the tank’s HP with each blow.