I don't know whether this was posted before or known before -obviously some people must have taught of this as well- but here's the trick I found today while fighting last boss of ET HM:
Hard mode of this dungeon the same fight as normal mode with lots of adds who give a debuff on you which make you go to the opposite direction than you are intending to go to.
Basically by binding opposite keys while pressing shift to movement keys, you can be -in a way- not affected by the debuff. What you have to do is when you get the debuff you have to press shift while moving.
The binds should be looking like this:
GL with drops peeps.
note: guide in my native tongue Türkçesi için tıklayın (Turkish)