AI Difficulty Spike in Star Wars Battlefront 2

Im having an extremely hard time playing instant action on "normal" dificulty and as you said i notice the spike too, just in normal difficulty i get one shooted, all my weapons nerfed, granade do nothing....AI seems to be extra OP if were using wall hack and aimbot, you name it and all of this in normal....and if you change settings difficulty appears to be the same no matter what is it easy.....and in the other hand playing coop seems just to be fine for me.