any way to make DH shadow impale work for GRs?

Hi there

i tryed the shadow impale routine already included with trinity, but its working realy bad actualy.

Even if i choose the option to only attack elites he wont do so, even with clustersize 20+ hes attacking single thrash monsters.

Some tips or hints to improve it maybe?

 

Do you have the Shadow Three Knives(Impale build)? Thats the build I use. Cluster size 8, Health Emergency 40%. I can run 85s in about 7 mins.

 

any other option you used?
like fighting rare thrash ?

 

Pretty much left everything else default.