Black ops????????????

My aim is kinda bad I have good class set ups i play on a 3 sensitivey it's comfertable for me I get dogs or chopper gunner at least 3 times a day and I want to get them more often also my kill streaks are uav black bird dogs or chopper gunner depends on which map I'm on any tips will help I want to get at least the black bird more often any tips I have ps3 and I know I already put aim assit on