The low altitude lock block should be removed

Then use rpg's or TOW launchers which hit the heli in one shot kill...

I consider my self a good heli pilot and on maps where the enemy team is scattered and has at least 2 stinger missiles you can't do much... fly low get rekt by atgm's or rpg's (even when flying fast because you have 0 cover) if you fly high one missile misses when you use flares but then you get another one comming just for you ... if you have a problem with helicopters it is pure skill issue since most of my heli kills are from an rpg xD