See How Counts Per Degree work and Steer settings Tutorial - Operations/Getting Started - AgOpenGPS
As I remember me correctly, It’s recomment to set CPD not to real value WAS angle for example -55 … 0 … 55° but instead of it use -25° … 0 … 25°, that means CPD is set lower. High CPD values makes respones faster but unstable, lower CPD smoother.