some may disagee with me on this,I never had that problem but Walker likes to go too far in being the dominate cat sometimes,he hisses and bites for no reason(to my knowledge but i know there is a kitty reason)well what i do is this(i profected the kitty hiss sound so well the cats ears go back)i deepen my voice and (to any kitty preforming the aggression)what a bad kitty stop it now.If they dont stop,I do the hiss in one long pro longed hiss.And stomp the floor really hard,which rocks their world. and after the agressor runs i give him/her 10 mins i go find them and kiss their little head and tell them its ok and all is done.FOr biters I do this i let them bit the back of my hand or put my finger in from the side and let them chomp hard,when they bit the back side of the hand it doesnt hurt as much and the finger they cant chomp all the way down because your finger should be placed all the way in the mouth horizonally and never show your hurting from his/her bit.Kittys are smart,once they know you can not be hurt by biting and wont tolerate the beating up of others they calm down.
give it a try it may work,it has with my street kittys i adopted