biggest problem is the player not wiping out the area too quick.. im working on having the ferals head to the sewers in daylight hours and pour out at night (enough pouring out that the players are like oh shite...I better hole up somewhere for the night.) so far.. I have a fairly robust system..have tweaked out all the ferals so they are far more perceptive and considerably stronger. a level 20 character should have slight stress where a level 10 character will get chewed up without alot of stimppacks being used..