N/W Raptor farming

I've been trying to get the raptor farm to work on my necro for a while but it seems that my run succeeds half the time while the other half has me dying before I can kill any raptors. The main problem I see here is that my whirlwind attack keeps on getting interrupted or just fails. I thought wary stance provided me a 4 second window to not get interrupted?

My skill bar:

MoP
I am unstoppable
Hundred Blades
Wary Stance
Protector's defense
Soldier's defense
Finish Him
Whirlwind attack

Thank you

Remember to use Wary Stance only after everything has balled up, you want to use only and use Hundred Blades, Protector's Defense, Soldier's Defense while they ball up on you and then when they're balled use Wary Stance followed by WW Attack instantly.

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