Try training your back slow, under a controlled tempo. Open your back up when stretching forward, & squeeze & hold back at the end of the movement. This helps you to recruit more muscles, and stay tapped into your mind-muscle connection. Don’t use momentum when training like this. I guarantee you will feel your back more when working slower & using strict form. Muscle engagement & feeling your muscles work in sync helps you to keep progressing. How many sets & reps you use depends on your progra