The reason it's not workin for ya in lower guk is because of your lvl. I'm
gonna guess that most mobs in upper guk are green for you, or close to it.
When you are above the lvl of the mob by a certain amount, then you won't
always pull all of them if don't see you. At lvl 50, I can pull single
solusek kobolds because some are green, and even when they are low blue, most
every time, I can just stand and wait for one to see me, then yell and run at
me, but the other won't come because I'm too high lvl for them. So this is
why your throwing a star or knife at them works on easier mobs, but not on
the harder ones.

Kanja
50 monk
Rodcet Nife