Hey BK, headhsotS? You only aim for the head when the shields are low. You aim for the torso 3 shots, then poke up for the 4shot.
Also. Yeah modded controllers are a pain, but if somebody has mastered quad-shotting, I can't complain. Mastering quad shot's (and double shots for that manner) is very difficult. Unfortunately there's no way to tell if the controller is modded or not :(.............. But if there was a way, then quad shot your little heart out because there's nothing sicker than getting shot at from behind then turning around and pulling off a perfect quad shot.