Are you able to create& maintain a rigid spine and stable shoulder position?
If not go to strict pull ups to ingrain good mechanics in a low risk environment.
Your grip may not allow you to create torque at your shoulder.
Grip dictates the ability to create torque in the shoulder and keep the rib cage down.
Looking at Carl Paoli’s hook grip is one approach.
Your Thumbs, The Hook Grip, and Better Pull Up Shoulder Stability Part 1
Your Thumbs, The Hook Grip, and Better Pull Up Shoulder Stability Part 2
An improved grip will help to create torque and sets a stable shoulder position