I don't really understand the issue with the felhunter pack, positioning the pitlord out of los might work but why even bother?
When they spawn stay near your pitlord, burn DS and kill them, if/when they dispell enslave use HOWL OF TERROR which will fear the felhunters and the pitlord aswell, finish them off easily and enslave the pitlord again.
If Kan casts a CB while you are doing this (which I don't think it happened to me), just use UR+BD or sac pact are you will be fine.