The Ready State Virtual Mobility Coach is like having a virtual Kelly Starrett in your pocket.
Are you organized at the spine?
The spine is the carriage for the primary engines of the shoulder.& hip.
Disorganization at the trunk results in less shoulder function.
Disorganization at the trunk will impact the pelvis(primary engine#2) which impacts hip function.
It sounds like you are not maintaining the needed torsion force throughout the movement.
Category 1 movement you start in a position of high stability maintain connection(torsion force) through the entire range of the movement , and end in a position of high stability.
Your hands may be in the correct positioning, but it doesn’t sound like you are maintaining proper shoulder positioning throughout the range of the movement.