Gears 5 classic alt scheme

How to fix shot delay in classic alt controller scheme.
Bcz whenever i fire a shot it got cancel and slides or take cover in wall.
I am using classic alt scheme with single stick movement on.
And x button is mapped to A.
Please any one help me to fix this.otherwise this scheme is fire.wallbouncing is perfect.but bcz of this most of the times i missed shots and slides.