Agreed with all the comments above. Another way to set the gas block properly is to open it completely, load a full magazine fire a shot. Then, close the screw a little and fire another shot. Keep closing off the screw until the gun does not chamber the next round... back off a little. This is the point where recoil is effectively "tuned out" for that specific ammo.
Of course if you change ammo you have to go thru this process again.