Sniper flinch is mad inconsistent. Sometimes it actually works and sometimes I get a headshot idk

All I know is of the enemy is hard scoping a lane I ain’t going in it, because even if I do some trickery slide- crouch strafing and pre fire/ shooting, he still poping my head off n it gets worse going against arbalest, Ive been 360 crit shotted many times where I think no way you should hit that shot!